[DOCSTRING]: `SamConfig`,     `SamPromptEncoderConfig`,
Author: rajveer43
Pull request: yes

# What does this PR do?

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Fixes and part of  #26638


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Comments:
@ydshieh review it

Please run `make fixup`, check the changes, and push it. The CI is not green :-) so far.