Phi2 Generation example

[trajepl]

Describe your changes

1. Phi2 generation example run in linux and windows.
2. Update the way to match input's past_key_values in conversion passes with regex match.

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.
• Is this PR including examples changes? If yes, please remember to update example documentation in a follow-up PR.

(Optional) Issue link

[guotuofeng]

Update how past_key_values is different between Windows and Linux in description for more clarification.