Actually fix Mesh:setIndexBuffer;

api/init.lua

@@ -15323,7 +15323,13 @@ return {
               },
               variants = {
                 {
-                  arguments = {},
+                  arguments = {
+                    {
+                      name = "buffer",
+                      type = "Buffer",
+                      description = "The index buffer."
+                    }
+                  },
                   returns = {}
                 }
               }

api/lovr/graphics/Mesh/setIndexBuffer.lua

@@ -7,13 +7,13 @@ return {
 
     The Buffer must have a single field with the `u16`, `u32`, `index16`, or `index32` type.
   ]],
-  arguments = {},
-  returns = {
+  arguments = {
     buffer = {
       type = 'Buffer',
       description = 'The index buffer.'
     }
   },
+  returns = {},
   variants = {
     {
       arguments = { 'buffer' },