[connection] provide some missing documentation bits
The previous changesets remove information about session data and transaction data.
We provide the necessary entries in the docstring of the Connection class.
Related to #3933480.
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
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\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
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syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/