[docs] add an instruction to start the instance

[sharder996]

Work done by @network-charles in #4052

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Fixes #3883

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.30%. Comparing base (7ca76da) to head (b6bec28).
⚠️ Report is 418 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4168      +/-   ##
==========================================
- Coverage   89.31%   89.30%   -0.01%     
==========================================
  Files         259      259              
  Lines       15684    15684              
==========================================
- Hits        14008    14007       -1     
- Misses       1676     1677       +1     

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[geoffreynyaga]

This looks good to me.

[xmkg]

The coverage regression makes no sense since:

a-) We already have a unit test for it
b-) This MR does not include any code changes

Queuing this one.