[MERGE][#84763] Expanded log help

[Ian Clatworthy]

John Arbash Meinel wrote:

> I haven't gone through all of the text. Everything I've read is well
> written and good to have. Just not in the short online help you should
> get from "bzr help log"

After discussing this on the mailing list I've put a separate patch up
for making help on a command concise by default with "help -v xxx"
giving the full story.

This patch splits out the bulk of the log format help into it's own
topic. It also tries to better explain how logging a range of revisions
works. The updated help texts are attached.

Ian C.
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