Minor documentation corrections.

include/freetype/freetype.h

@@ -3032,11 +3032,13 @@ FT_BEGIN_HEADER
   /*    @FT_Get_Kerning.                                                   */
   /*                                                                       */
   /* <Values>                                                              */
-  /*    FT_KERNING_DEFAULT  :: Return scaled and grid-fitted kerning       */
-  /*                           distances (value is~0).                     */
+  /*    FT_KERNING_DEFAULT  :: Return grid-fitted kerning distances in     */
+  /*                           pixels (value is~0).  Whether they are      */
+  /*                           scaled depends on @FT_LOAD_NO_SCALE.        */
   /*                                                                       */
-  /*    FT_KERNING_UNFITTED :: Return scaled but un-grid-fitted kerning    */
-  /*                           distances.                                  */
+  /*    FT_KERNING_UNFITTED :: Return un-grid-fitted kerning distances in  */
+  /*                           26.6 fractional pixels.  Whether they are   */
+  /*                           scaled depends on @FT_LOAD_NO_SCALE.        */
   /*                                                                       */
   /*    FT_KERNING_UNSCALED :: Return the kerning vector in original font  */
   /*                           units.                                      */
@@ -3082,9 +3084,10 @@ FT_BEGIN_HEADER
   /*                   kerning vector.                                     */
   /*                                                                       */
   /* <Output>                                                              */
-  /*    akerning    :: The kerning vector.  This is either in font units   */
-  /*                   or in pixels (26.6 format) for scalable formats,    */
-  /*                   and in pixels for fixed-sizes formats.              */
+  /*    akerning    :: The kerning vector.  This is either in font units,  */
+  /*                   fractional pixels (26.6 format), or pixels for      */
+  /*                   scalable formats, and in pixels for fixed-sizes     */
+  /*                   formats.                                            */
   /*                                                                       */
   /* <Return>                                                              */
   /*    FreeType error code.  0~means success.                             */

include/freetype/fttrigon.h

@@ -225,8 +225,8 @@ FT_BEGIN_HEADER
    *
    * @description:
    *   Return the unit vector corresponding to a given angle.  After the
-   *   call, the value of `vec.x' will be `sin(angle)', and the value of
-   *   `vec.y' will be `cos(angle)'.
+   *   call, the value of `vec.x' will be `cos(angle)', and the value of
+   *   `vec.y' will be `sin(angle)'.
    *
    *   This function is useful to retrieve both the sinus and cosinus of a
    *   given angle quickly.