Revert changes when validating glossary

tools/check.py

@@ -461,7 +461,8 @@ class ReferencePageValidator(MarkdownValidator):
         ```definition_lists``` extension.
 
         That syntax isn't supported by the CommonMark parser, so we identify
-         terms manually."""
+        terms manually."""
+        glossary_keyword = glossary_entry[0]
         if len(glossary_entry) < 2:
             logging.error(
                 "In {0}: "