docs(instance): fix terminate action documentation and remove b_ssd volumes documentation

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.65%. Comparing base (5bf53e0) to head (4bf3519).
⚠️ Report is 1048 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (4bf3519). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (4bf3519)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4820       +/-   ##
===========================================
- Coverage   75.45%   54.65%   -20.81%     
===========================================
  Files         202      317      +115     
  Lines       44323    80834    +36511     
===========================================
+ Hits        33444    44177    +10733     
- Misses       9653    35251    +25598     
- Partials     1226     1406      +180     

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