[webview_flutter_wkwebview] Fix typo of a method name, setCookieForInsances

[kosukesaigusa]

Just fixed a typo of a method name, from setCookieForInsances to setCookieForInstances

No version change: Only updates internal method name.

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• [x] I listed at least one issue that this PR fixes in the description above.
• [x] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
• [x] I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.
• [x] I updated/added relevant documentation (doc comments with ///).
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[bparrishMines]

Hi @KosukeSaigusa, thanks for fixing this.

Could you updated the CHANGELOG by following: https://github.com/flutter/flutter/wiki/Contributing-to-Plugins-and-Packages#updating-a-changelog-that-has-a-next.

[kosukesaigusa]

Thank you for your message, @bparrishMines. Now I updated the CHANGELOG.md in this commit: https://github.com/flutter/plugins/pull/6102/commits/cec0ebcbc33ce08a6a75c95c10edeb5ca7f9371b

[kosukesaigusa]

@bparrishMines Thank you. Resolved the conflict and updated the grammar.

[jmagman]

Is the only thing remaining here the CHANGELOG issue? @KosukeSaigusa can you rebase/merge onto top of tree and make sure your pubpsec and CHANGELOG version matches?

[jmagman]

Friendly ping, @KosukeSaigusa, this is so close to being mergeable! 🙂