Addressing more doc refs

Author: mwatts15

rdflib_sqlalchemy/statistics.py

@@ -22,8 +22,8 @@ def get_group_by_count(session, group_by_column):
     )
 
 
-class StatisticsMixin(object):
-
+class StatisticsMixin:
+    ''' Has methods for statistics on stores '''
     def statistics(self, asserted_statements=True, literals=True, types=True):
         """Store statistics."""
         statistics = {

rdflib_sqlalchemy/store.py

@@ -107,7 +107,7 @@ def __init__(self, identifier=None, configuration=None, engine=None,
                 corresponding to the connection options accepted by sqlalchemy.create_engine,
                 with the additional "url" key pointing to the connection URL. See `open` documentation
                 for more details.
-            engine (sqlalchemy.engine.Engine, optional): a pre-existing `SQLAlchemy.engine.Engine` instance.
+            engine (`sqlalchemy.engine.Engine`, optional): a pre-existing engine instance.
             max_terms_per_where (int): The max number of terms (s/p/o) in a call to
                 triples_choices to combine in one SQL "where" clause. Important for SQLite
                 back-end with SQLITE_MAX_EXPR_DEPTH limit and SQLITE_LIMIT_COMPOUND_SELECT