Add parameter item_name to docstring

Change-Id: I53692ff36004fdfe2a823da2c4c0113b9ab67de1
---
M pywikibot/pagegenerators.py
1 file changed, 2 insertions(+), 0 deletions(-)

diff --git a/pywikibot/pagegenerators.py b/pywikibot/pagegenerators.py
index 501d9ff..5d142a5 100644
--- a/pywikibot/pagegenerators.py
+++ b/pywikibot/pagegenerators.py
@@ -2953,6 +2953,8 @@
     @param query: the SPARQL query string.
     @param site: Site for generator results.
     @type site: L{pywikibot.site.BaseSite}
+    @param item_name: name of the item in the SPARQL query
+    @type item_name: str
     @param endpoint: SPARQL endpoint URL
     @type endpoint: str
     @param entity_url: URL prefix for any entities returned in a query.

