Align docs with current quat API

Vector rotation had wrong return type specified and it was not obvious
that input vector is modified in place.

The `quat:set(angle, vec3)` variant is not implemented. While it could
be added it's also not hard to do `quat:set(angle, vec3:unpack())`.

api/init.lua

@@ -17862,7 +17862,7 @@ return {
             {
               name = "mul",
               summary = "Multiply a quaternion by another quaternion or a vector.",
-              description = "Multiplies this quaternion by another value.  If the value is a quaternion, the rotations in the two quaternions are applied sequentially and the result is stored in the first quaternion.  If the value is a vector, then the vector is rotated by the quaternion.",
+              description = "Multiplies this quaternion by another value.  If the value is a quaternion, the rotations in the two quaternions are applied sequentially and the result is stored in the first quaternion.  If the value is a vector, then the input vector is rotated by the quaternion and returned.",
               key = "Quat:mul",
               module = "lovr.math",
               variants = {
@@ -17885,16 +17885,16 @@ return {
                 {
                   arguments = {
                     {
-                      name = "v",
+                      name = "v3",
                       type = "vec3",
                       description = "A vector to rotate."
                     }
                   },
                   returns = {
                     {
-                      name = "q",
-                      type = "quat",
-                      description = "The original quaternion."
+                      name = "v3",
+                      type = "vec3",
+                      description = "Vector rotated by quaternion."
                     }
                   }
                 }
@@ -17926,7 +17926,7 @@ return {
             {
               name = "set",
               summary = "Set the components of the quaternion.",
-              description = "Sets the components of the quaternion.  There are lots of different ways to specify the new components, the summary is:\n\n- Four numbers can be used to specify an angle/axis rotation, similar to other LÖVR functions.\n  - Alternatively, a `vec3` can be used for the axis.\n- Four numbers plus the fifth `raw` flag can be used to set the raw values of the quaternion.\n- An existing quaternion can be passed in to copy its values.\n- A single direction vector can be specified to turn its direction (relative to the default\n  forward direction of \"negative z\") into a rotation.\n- Two direction vectors can be specified to set the quaternion equal to the rotation between the\n  two vectors.\n- A matrix can be passed in to extract the rotation of the matrix into a quaternion.",
+              description = "Sets the components of the quaternion.  There are lots of different ways to specify the new components, the summary is:\n\n- Four numbers can be used to specify an angle/axis rotation, similar to other LÖVR functions.\n- Four numbers plus the fifth `raw` flag can be used to set the raw values of the quaternion.\n- An existing quaternion can be passed in to copy its values.\n- A single direction vector can be specified to turn its direction (relative to the default\n  forward direction of \"negative z\") into a rotation.\n- Two direction vectors can be specified to set the quaternion equal to the rotation between the\n  two vectors.\n- A matrix can be passed in to extract the rotation of the matrix into a quaternion.",
               key = "Quat:set",
               module = "lovr.math",
               related = {
@@ -17973,27 +17973,6 @@ return {
                     }
                   }
                 },
-                {
-                  arguments = {
-                    {
-                      name = "angle",
-                      description = "The angle to use for the rotation, in radians.",
-                      default = "0"
-                    },
-                    {
-                      name = "axis",
-                      type = "vec3",
-                      description = "The axis of rotation (does not need to be normalized)."
-                    }
-                  },
-                  returns = {
-                    {
-                      name = "q",
-                      type = "quat",
-                      description = "The original quaternion."
-                    }
-                  }
-                },
                 {
                   arguments = {
                     {

api/lovr/math/Quat/mul.lua

@@ -3,14 +3,14 @@ return {
   description = [[
     Multiplies this quaternion by another value.  If the value is a quaternion, the rotations in the
     two quaternions are applied sequentially and the result is stored in the first quaternion.  If
-    the value is a vector, then the vector is rotated by the quaternion.
+    the value is a vector, then the input vector is rotated by the quaternion and returned.
   ]],
   arguments = {
     r = {
       type = 'quat',
       description = 'A quaternion to combine with the original.'
     },
-    v = {
+    v3 = {
       type = 'vec3',
       description = 'A vector to rotate.'
     }
@@ -19,6 +19,10 @@ return {
     q = {
       type = 'quat',
       description = 'The original quaternion.'
+    },
+    v3 = {
+      type = 'vec3',
+      description = 'Vector rotated by quaternion.'
     }
   },
   variants = {
@@ -27,8 +31,8 @@ return {
       returns = { 'q' }
     },
     {
-      arguments = { 'v' },
-      returns = { 'q' }
+      arguments = { 'v3' },
+      returns = { 'v3' }
     }
   }
 }

api/lovr/math/Quat/set.lua

@@ -5,7 +5,6 @@ return {
     components, the summary is:
 
     - Four numbers can be used to specify an angle/axis rotation, similar to other LÖVR functions.
-      - Alternatively, a `vec3` can be used for the axis.
     - Four numbers plus the fifth `raw` flag can be used to set the raw values of the quaternion.
     - An existing quaternion can be passed in to copy its values.
     - A single direction vector can be specified to turn its direction (relative to the default
@@ -34,10 +33,6 @@ return {
       default = '0',
       description = 'The z component of the axis of rotation.'
     },
-    axis = {
-      type = 'vec3',
-      description = 'The axis of rotation (does not need to be normalized).'
-    },
     raw = {
       type = 'boolean',
       default = 'false',
@@ -71,10 +66,6 @@ return {
       arguments = { 'angle', 'ax', 'ay', 'az', 'raw' },
       returns = { 'q' }
     },
-    {
-      arguments = { 'angle', 'axis' },
-      returns = { 'q' }
-    },
     {
       arguments = { 'r' },
       returns = { 'q' }