docs: Fix wording describing the hwaddress sanitizer

docs: Fix wording describing the hwaddress sanitizer

The original documentation added to mention the clash between
-fsanitize=address and -fsanitize=hwaddress used confusing wording trying
to say that -fsanitize=hwaddress is only available on AArch64.

It read as if -fsanitize=address were only supported on AArch64.

This patch fixes that wording by being more explicit.

gcc/ChangeLog:

	PR other/98437
	* doc/invoke.texi (-fsanitize=address): Fix wording describing
	clash with -fsanitize=hwaddress.