docs: some grammar fixes for meshDrawer2D

Fixes #941

panda/src/grutil/meshDrawer2D.I

@@ -60,7 +60,7 @@ set_budget(int total_budget) {
 }
 
 /**
- * Gets the total triangle budget of the drawer
+ * Gets the total triangle budget of the drawer.
  */
 INLINE int MeshDrawer2D::
 get_budget() {
@@ -68,7 +68,7 @@ get_budget() {
 }
 
 /**
- * Sets clipping rectangle
+ * Sets the clipping rectangle.
  */
 INLINE void MeshDrawer2D::
 set_clip(PN_stdfloat x, PN_stdfloat y, PN_stdfloat w, PN_stdfloat h) {
@@ -79,7 +79,7 @@ set_clip(PN_stdfloat x, PN_stdfloat y, PN_stdfloat w, PN_stdfloat h) {
 }
 
 /**
- * Draws a 2d rectangle.  Ignores the cliping rectangle
+ * Draws a 2D rectangle.  Ignores the clipping rectangle.
  */
 INLINE void MeshDrawer2D::
 quad_raw(const LVector3 &v1, const LVector4 &c1, const LVector2 &uv1,
@@ -125,7 +125,7 @@ rectangle_raw(PN_stdfloat x, PN_stdfloat y, PN_stdfloat w, PN_stdfloat h,
 }
 
 /**
- * Draws a 2d rectangle, that can be cliped
+ * Draws a 2D rectangle which can be clipped.
  */
 INLINE void MeshDrawer2D::
 rectangle(PN_stdfloat x, PN_stdfloat y, PN_stdfloat w, PN_stdfloat h,

panda/src/grutil/meshDrawer2D.h

@@ -39,8 +39,8 @@
 #include "nodePath.h"
 
 /**
- * This class allows the drawing of 2d objects - mainly based on quads and
- * rectangles.  Allows clipping and serverl high level UI theme functions.
+ * This class allows the drawing of 2D objects - mainly based on quads and
+ * rectangles.  It allows clipping and several high level UI theme functions.
  */
 class EXPCL_PANDA_GRUTIL MeshDrawer2D : public TypedObject {
 PUBLISHED: