gcc/ChangeLog:
* doc/extend.texi (Common Function Attributes): Fix grammar.
i.e., that the pointer @var{P} returned by the function cannot alias any
other pointer valid when the function returns, and moreover no
pointers to valid objects occur in any storage addressed by @var{P}. In
-addition, the GCC predicts that a function with the attribute returns
+addition, GCC predicts that a function with the attribute returns
non-null in most cases.
Independently, the form of the attribute with one or two arguments