doc: Fix a typo in the documentation of the copy attribute

2020-04-01  Zackery Spytz  <zspytz@gmail.com>

gcc/
	* doc/extend.texi: Fix a typo in the documentation of the
	copy function attribute.

gcc/ChangeLog

+2020-04-01  Zackery Spytz  <zspytz@gmail.com>
+
+	* doc/extend.texi: Fix a typo in the documentation of the
+	copy function attribute.
+
 2020-04-01  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/94423

gcc/doc/extend.texi

@@ -2817,7 +2817,7 @@ the same type as the target function.  As a result of the @code{copy}
 attribute the alias also shares the same attributes as the target.
 
 @smallexample
-#define StrongAlias(TagetFunc, AliasDecl)   \
+#define StrongAlias(TargetFunc, AliasDecl)  \
   extern __typeof__ (TargetFunc) AliasDecl  \
     __attribute__ ((alias (#TargetFunc), copy (TargetFunc)));