Fix proto comment

While we're at it, we also change a related comment to use American English
consistently.

Author: cmb69

ext/gd/gd.c

@@ -1644,7 +1644,7 @@ PHP_FUNCTION(imageistruecolor)
 /* }}} */
 
 /* {{{ proto void imagetruecolortopalette(resource im, bool ditherFlag, int colorsWanted)
-   Convert a true colour image to a palette based image with a number of colours, optionally using dithering. */
+   Convert a true color image to a palette based image with a number of colors, optionally using dithering. */
 PHP_FUNCTION(imagetruecolortopalette)
 {
 	zval *IM;
@@ -1670,8 +1670,8 @@ PHP_FUNCTION(imagetruecolortopalette)
 
 
 
-/* {{{ proto void imagetruecolortopalette(resource im, bool ditherFlag, int colorsWanted)
-   Convert a true colour image to a palette based image with a number of colours, optionally using dithering. */
+/* {{{ proto void imagepalettetotruecolor(resource im)
+   Convert a palette based image to a true color image. */
 PHP_FUNCTION(imagepalettetotruecolor)
 {
 	zval *IM;