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

[Aaron Bentley]

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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.

Aaron
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