SDL_log.h: Use ASCII characters.

(was missed in commit 7ca676aeed for issue #10636)

include/SDL3/SDL_log.h

@@ -22,7 +22,7 @@
 /**
  * # CategoryLog
  *
- * Simple log messages with priorities and categories. A message’s
+ * Simple log messages with priorities and categories. A message's
  * SDL_LogPriority signifies how important the message is. A message's
  * SDL_LogCategory signifies from what domain it belongs to. Every category
  * has a minimum priority specified: when a message belongs to that category,