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

[Alexander Belchenko]

This patch adds BZR_SSH to the output of bzr help env-variables:

Environment Variables

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BZRPATH          Path where bzr is to look for shell plugin external commands.
BZR_EMAIL        E-Mail address of the user. Overrides EMAIL.
EMAIL            E-Mail address of the user.
BZR_EDITOR       Editor for editing commit messages. Overrides EDITOR.
EDITOR           Editor for editing commit messages.
BZR_PLUGIN_PATH  Paths where bzr should look for plugins.
BZR_HOME         Directory holding .bazaar config dir. Overrides HOME.
BZR_HOME (Win32) Directory holding bazaar config dir. Overrides APPDATA and HOME.
BZR_REMOTE_PATH  Full name of remote 'bzr' command (for bzr+ssh:// URLs).
BZR_SSH          SSH client: paramiko (default), openssh, ssh, plink.
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