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:

• [x] squashed commits
• [x] includes documentation
• [ ] adds unit tests

[nilekhc]

/cc @sozercan

[k8s-ci-robot]

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In response to [this](https://github.com/kubernetes-sigs/secrets-store-csi-driver/pull/1531#issuecomment-2136201813): >/cc @sozercan Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[nilekhc]

@sozercan fyi

[codecov-commenter]

Codecov Report

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

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

Additional details and impacted files

```diff @@ 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/secrets-store-csi-driver/blob/main/OWNERS)~~ [aramase] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment