docs: adds troubleshooting guide for kubeletRootDir

[nilekhc]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #1527

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests

[nilekhc]

/cc @sozercan

[k8s-ci-robot]

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[nilekhc]

@sozercan fyi

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.83%. Comparing base (bf86dbf) to head (df34f89).
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1531      +/-   ##
==========================================
- Coverage   36.58%   35.83%   -0.76%     
==========================================
  Files          63       63              
  Lines        4532     3759     -773     
==========================================
- Hits         1658     1347     -311     
+ Misses       2730     2268     -462     
  Partials      144      144              

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[aramase]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aramase, nilekhc

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