Broken link to FAQ in docs

[Jeff Widman]

https://github.com/zzzeek/sqlalchemy/edit/master/doc/build/orm/session_basics.rst#l161

the '</faq/index>' part isn't actually hyperlinked in the generated docs: http://docs.sqlalchemy.org/en/latest/orm/session_basics.html#session-frequently-asked-questions

I spent some time trying to figure out the syntax for Restructured text links and just decided I'll report it as someone else can probably fix in about two seconds...

[Mike Bayer]

cf21497f02e64b6dde 927804e4891eb thanks for reporting!