Review text functions return value

It needs to be freed

src/raylib.h

@@ -1186,8 +1186,8 @@ RLAPI unsigned int TextLength(const char *text);
 RLAPI unsigned int TextCountCodepoints(const char *text);                                   // Get total number of characters (codepoints) in a UTF8 encoded string
 RLAPI const char *TextFormat(const char *text, ...);                                        // Text formatting with variables (sprintf style)
 RLAPI const char *TextSubtext(const char *text, int position, int length);                  // Get a piece of a text string
-RLAPI const char *TextReplace(char *text, const char *replace, const char *by);             // Replace text string (memory should be freed!)
-RLAPI const char *TextInsert(const char *text, const char *insert, int position);           // Insert text in a position (memory should be freed!)
+RLAPI char *TextReplace(char *text, const char *replace, const char *by);                   // Replace text string (memory should be freed!)
+RLAPI char *TextInsert(const char *text, const char *insert, int position);                 // Insert text in a position (memory should be freed!)
 RLAPI const char *TextJoin(const char **textList, int count, const char *delimiter);        // Join text strings with delimiter
 RLAPI const char **TextSplit(const char *text, char delimiter, int *count);                 // Split text into multiple strings
 RLAPI void TextAppend(char *text, const char *append, int *position);                       // Append text at specific position and move cursor!