Fix typo of showCupertinoModalPopup documentation comment

[mono0926]

Description

Fix typo of showCupertinoModalPopup documentation comment.

Related Issues

None.

Tests

None.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Did any tests fail when you ran them? Please read Handling breaking changes.

• No, no existing tests failed, so this is not a breaking change.

[fluttergithubbot]

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie.

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

[mono0926]

@Hixie

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie.

This is just a fix of typo, so there are no tests.

[HansMuller]

LGTM

[fluttergithubbot]

This pull request is not suitable for automatic merging in its current state.

• The status or check suite web_tests-3-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
• The status or check suite web_tests-5-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.

[LongCatIsLooong]

Hi @mono0926 some tests keep failing. Could you rebase this pull request to the tip of the tree and see if that fixes the tests?

[mono0926]

@LongCatIsLooong

Could you rebase this pull request to the tip of the tree and see if that fixes the tests?

I did it, but there are failed tests, which seems to be not related this change 🤔