docs: fix typo in README.md for HotToastConfig Import

[shemzz]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

A typo exists in the README.md where provideHotToastConfig is mistakenly written as providerHotToastConfig.

Issue Number: N/A

What is the new behavior?

The typo has been corrected to provideHotToastConfig.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

No additional changes were made beyond fixing the typo.

[shhdharmen]

fix commit message. Run npm run commit after staging your files.