Mark nullability of RNLog class

[mdvacca]

Summary: Mark nullability of RNLog class

changelog: [internal] internal

Differential Revision: D53393953

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D53393953

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	17,237,527	-16
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	20,604,290	-3
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: fbc090d070c2701c279214e88096672425272b3b Branch: main

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D53393953

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D53393953

[facebook-github-bot]

This pull request has been merged in facebook/react-native@e2fa62d6ad94eff3cda1a5b47c4ca17a6f230122.