Fix template variable typo in finsrv

Change duplicate {{author_name}} to {{author_email}} in finsrv template
file.

finsrv.erl

@@ -1,5 +1,5 @@
 %%%'   HEADER
-%%% @author {{author_name}} <{{author_name}}>
+%%% @author {{author_name}} <{{author_email}}>
 %%% @copyright {{copyright_year}} {{author_name}}
 %%% @doc gen_server callback module implementation:
 %%% {{description}}