Update --ssh desc

[glkappe]

What problem does this PR solve?

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 50.88%. Comparing base (9e11d0e) to head (29644e6).

:exclamation: Current head 29644e6 differs from pull request most recent head bec394d. Consider uploading reports for the commit bec394d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2380      +/-   ##
==========================================
- Coverage   56.05%   50.88%   -5.17%     
==========================================
  Files         329      328       -1     
  Lines       35040    35017      -23     
==========================================
- Hits        19639    17815    -1824     
- Misses      13064    14877    +1813     
+ Partials     2337     2325      -12     

Flag	Coverage Δ
tiup	33.59% <ø> (-0.05%)	:arrow_down:
unittest	?

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