Sync SDL2 wiki -> header

include/SDL_bits.h

@@ -59,7 +59,7 @@ extern __inline int _SDL_bsr_watcom(Uint32);
 /**
  * Use this function to get the index of the most significant (set) bit in a
  *
- * \param x the number to find the MSB of
+ * \param x the number to find the MSB of.
  * \returns the index of the most significant bit of x, or -1 if x is 0.
  */
 SDL_FORCE_INLINE int