[Doc]fix typo

[hiroki0525]

Description

fix typo.

All Promptflow Contribution checklist:

• The pull request does not introduce [breaking changes].
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

SDK CLI Global Config Test Result fix-doc

6 tests   6 ✅  1m 17s ⏱️
1 suites  0 💤
1 files    0 ❌

Results for commit e6a99cf.

♻️ This comment has been updated with latest results.

[hiroki0525]

@wangchao1230 @brynn-code
how can I merge this pull request?

[wangchao1230]

@wangchao1230 @brynn-code how can I merge this pull request?

As we got enough approves. let me merge this after all CI passes.