Added import of synonym in example code in Synonym portion of docs

(cherry picked from commit 4f857567923ccdbd18dae7a4aa98db040d396e57)

diff --git a/doc/build/orm/mapped_attributes.rst b/doc/build/orm/mapped_attributes.rst
index b8a0f89c948d9f67df5c3c07f3aa84c6bb596eac..72a91421d73e31bbcf5ca37ffc60fd8177dee547 100644 (file)
--- a/doc/build/orm/mapped_attributes.rst
+++ b/doc/build/orm/mapped_attributes.rst
@@ -254,6 +254,8 @@ to "mirror" another attribute that is mapped.
 In the most basic sense, the synonym is an easy way to make a certain
 attribute available by an additional name::
 
+    from sqlalchemy.orm import synonym
+    
     class MyClass(Base):
         __tablename__ = 'my_table'