bug19381 - bad link: python API internal bookmark doesn't exist
bug19381 - bad link: python API internal bookmark doesn't exist

"Dedicated back end" changed to "dedicated session" and the
internal link anchor didn't keep pace in python-API-40.html.

The links now say "dedicated session" and jump to the section
about transaction semantics.

No release notes.  Tested the links in Firefox.

Change-Id: I0cc9d7e6335b23bfb5d2b670bfc8f9fb146b3909

franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python