[linter] Stray newline and spaces typo.

[modulovalue]

sdk/pkg/linter/lib/src/rules/invalid_runtime_check_with_js_interop_types.dart

Lines 29 to 31 in df5b131

	const _desc =
	r'''Avoid runtime type tests with JS interop types where the result may not
	be platform-consistent.''';

There's a stray newline + spaces.

Compare that to:

sdk/pkg/linter/lib/src/rules/unnecessary_library_directive.dart

Lines 15 to 17 in df5b131

	const _desc =
	'Avoid library directives unless they have documentation comments or '
	'annotations.';

Which is likely what was intended there.

cc @srujzs

[FMorschel]

Thanks for catching that and for trying to fix it!

FYI @srawlins @bwilkerson