Fix flake8

Author: jonaschn

gensim/models/ldamodel.py

@@ -314,7 +314,7 @@ def load(cls, fname, *args, **kwargs):
 
 
 class LdaModel(interfaces.TransformationABC, basemodel.BaseTopicModel):
-    """Train and use Online Latent Dirichlet Allocation models as presented in `'Online Learning for LDA' by Hoffman et al.`_
+    """Train and use Online Latent Dirichlet Allocation model as presented in `'Online Learning for LDA' by Hoffman et al.`_
 
     Examples
     -------