ordinary-bill-to-act: Fix inaccuracy about bills lapsing

Bills lapse when the Lok Sabha is dissolved (by the President, or at the end of
a term, whichever). Not when a session ends. In addition, all bills except those
introduced in the Rajya Sabha and pending in it lapse.

Add a new source that makes this absolutely clear.

Session vs term inconsistency pointed out by Swagat N