fixed typo 'one short connection' to 'one shot'

(cherry picked from commit 25776dbf76dfbc087582991bea3169e7b39b9340)

doc/base/classes.xml

@@ -24293,7 +24293,7 @@
 			Persisting connections are saved when the object is serialized to file.
 		</constant>
 		<constant name="CONNECT_ONESHOT" value="4">
-			One short connections disconnect themselves after emission.
+			One shot connections disconnect themselves after emission.
 		</constant>
 	</constants>
 </class>