This fixes a small typo in the Label attributes docs.
gcc/ChangeLog:
* doc/extend.texi: Fix typo in unsed attribute docs.
@item unused
This feature is intended for program-generated code that may contain
unused labels, but which is compiled with @option{-Wall}. It is
-not normally appropriate to use in it human-written code, though it
+not normally appropriate to use it in human-written code, though it
could be useful in cases where the code that jumps to the label is
contained within an @code{#ifdef} conditional.