push: spell 'Note about fast-forwards' section name correctly in error message.

The error message in case of non-fast forward points to 'git push
--help', but used to talk about a section 'non-fast-forward', while the
actual section name is 'Note about fast-forwards'.

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-push.c

@@ -125,8 +125,8 @@ static int push_with_options(struct transport *transport, int flags)
 
 	if (nonfastforward && advice_push_nonfastforward) {
 		printf("To prevent you from losing history, non-fast-forward updates were rejected\n"
-		       "Merge the remote changes before pushing again.  See the 'non-fast-forward'\n"
+		       "Merge the remote changes before pushing again.  See the 'Note about\n"
-		       "section of 'git push --help' for details.\n");
+		       "fast-forwards' section of 'git push --help' for details.\n");
 	}
 
 	return 1;