docs(credential-provider-sso): readme fixes, clarification

[allenluce]

Issue

N/A

Description

Clarifies the SSO provider documentation, removes ambiguity, fixes typos and aligns tenses.

Testing

N/A, documentation change only

[AllanZhengYP]

Thank you for the fix! 🚢

[alexforsyth]

@allenluce thanks so much for the PR! Even though its just doc updates, I'll let CI pass and then merge it.

[codecov-commenter]

Codecov Report

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The diff coverage is n/a.

❗ Current head 531af40 differs from pull request most recent head 7a53e0b. Consider uploading reports for the commit 7a53e0b to get more accurate results

@@           Coverage Diff           @@
##             main    #2488   +/-   ##
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  Coverage        ?   59.54%           
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  Files           ?      493           
  Lines           ?    26357           
  Branches        ?     6261           
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  Hits            ?    15695           
  Misses          ?    10662           
  Partials        ?        0           

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[allenluce]

Sound good! Looks like I forgot a colon in the commit message. I've fixed that and moved the commit to the current top of the main branch.

[github-actions]

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