docs: fix aws sso documentation

[chansuke]

Fixes: #20680

• Update the image of Identity Center (AWS SSO)
• Removed the comma next to the picture
  

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[gdsoumya]

not sure if these changes were intentional, if not we should probably undo these