[MERGE] List possible values for BZR_SSH environment variable in env-variables help topic. (#181842)

[Alexander Belchenko]

Aaron Bentley пишет:
> Alexander Belchenko wrote:
>> This patch adds BZR_SSH to the output of bzr help env-variables:
> 
> bb:approve
> 
> If you feel like it, it would be nice to remove the top and bottom
> lines-- they don't match our style, they don't follow the terminal
> width, and they're more than 79 columns wide.

They actually ReST syntax used for bzr_man generation.
I'll look into ReST -> plain text filter used to print
help in terminal.