fix: update find_secret on Fabric and doc

[JessicaXYWang]

Add find_secret doc for ADB and Synapse Analytics.

work item to Fang's team: https://msdata.visualstudio.com/A365/_workitems/edit/2824561

[github-actions]

Hey @JessicaXYWang 👋!
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Someone from SynapseML Team will be reviewing this pull request soon.

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[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f3ae146) 86.19% compared to head (469ca36) 85.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2132      +/-   ##
==========================================
- Coverage   86.19%   85.32%   -0.87%     
==========================================
  Files         312      312              
  Lines       16483    16483              
  Branches     1462     1462              
==========================================
- Hits        14207    14064     -143     
- Misses       2276     2419     +143     

☔ View full report in Codecov by Sentry.
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[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[JessicaXYWang]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[JessicaXYWang]

@mhamilton723 please help to review. Dev team confirmed there won't be update for getSecret. It is by design. We should make change on our side.