[MERGE] Updates to the Launchpad plugin documentation

[Jonathan Lange]

Hello all,

Attached is a small bundle that makes a couple of simple improvements
to the text of 'bzr help launchpad'. In particular, I've added a
mention of launchpad-login and I've expanded the explanation of lp:///
URLs to include an example of "lp:///~user/product/branch-name"-style
URLs.

There's also a couple of removals of trailing whitespace.

jml
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