Add a comment to LoadFontEx to specify how to get the default character set. (#2221)

Co-authored-by: Jeffery Myers <JefMyers@blizzard.com>

src/raylib.h

@@ -1318,7 +1318,7 @@ RLAPI int GetPixelDataSize(int width, int height, int format);              // G
 // Font loading/unloading functions
 RLAPI Font GetFontDefault(void);                                                            // Get the default Font
 RLAPI Font LoadFont(const char *fileName);                                                  // Load font from file into GPU memory (VRAM)
-RLAPI Font LoadFontEx(const char *fileName, int fontSize, int *fontChars, int glyphCount);  // Load font from file with extended parameters
+RLAPI Font LoadFontEx(const char *fileName, int fontSize, int *fontChars, int glyphCount);  // Load font from file with extended parameters, use NULL for fontChars and 0 for glyphCount to load the default character set
 RLAPI Font LoadFontFromImage(Image image, Color key, int firstChar);                        // Load font from Image (XNA style)
 RLAPI Font LoadFontFromMemory(const char *fileType, const unsigned char *fileData, int dataSize, int fontSize, int *fontChars, int glyphCount); // Load font from memory buffer, fileType refers to extension: i.e. '.ttf'
 RLAPI GlyphInfo *LoadFontData(const unsigned char *fileData, int dataSize, int fontSize, int *fontChars, int glyphCount, int type); // Load font data for further use