g.extension: typo

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@49717 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/g.extension/g.extension.py

@@ -77,7 +77,7 @@
 #%end
 #%flag
 #% key: a
-#% description: List locally installed extension
+#% description: List locally installed extensions
 #% guisection: Print
 #% suppress_required: yes
 #%end