Fix typo in glossary syntax

TomDLT · TomDLT · commit ec409a902352 · 2018-02-02T18:59:01.000+01:00
diff --git a/doc/glossary.rst b/doc/glossary.rst
@@ -925,7 +925,7 @@ Class APIs and Estimator Types
 There are further APIs specifically related to a small family of estimators,
 such as:
 
-.. glossary:
+.. glossary::
 
     cross-validation splitter
     CV splitter
