Fix typo in invariant message

[sweatherall]

Summary

Fix a typo in the invariant message presented when ActionSheetManager does not exist (typo was found in 2 places)

Changelog

[General] [Fixed] - Fix typo in invariant message

Test Plan

Run ActionSheetIOS.showActionSheetWithOptions(...) on an Android emulator to get this invariant message to appear.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: f5c246d

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,209,417	-4
android	hermes	armeabi-v7a	6,858,589	-4
android	hermes	x86	7,644,053	-16
android	hermes	x86_64	7,534,989	-20
android	jsc	arm64-v8a	9,369,054	-4
android	jsc	armeabi-v7a	9,010,358	-4
android	jsc	x86	9,231,778	-4
android	jsc	x86_64	9,808,918	0

Base commit: f5c246d

[facebook-github-bot]

@appden has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @sweatherall in 9c353b5.

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