The sample code used within the comments in textContaining is wrong #100859
Description
textContain is used instead of textContaining in the sample code used within the comments of textContaining.
Expected results:
/// (Omitted)
///
/// ```dart
/// expect(find.textContaining('Back'), findsOneWidget);
/// expect(find.textContaining(RegExp(r'(\w+)')), findsOneWidget);
/// ```
///
/// (Omitted)
///
/// ```dart
/// expect(find.textContaining('Close', findRichText: true), findsOneWidget);
/// expect(find.textContaining(RegExp(r'(\w+)'), findRichText: true), findsOneWidget);
/// ```
/// (Omitted)
///
Finder textContaining(
Pattern pattern, {
bool findRichText = false,
bool skipOffstage = true,
}) {Actual results
/// (Omitted)
///
/// ```dart
/// expect(find.textContain('Back'), findsOneWidget);
/// expect(find.textContain(RegExp(r'(\w+)')), findsOneWidget);
/// ```
///
/// (Omitted)
///
/// ```dart
/// expect(find.textContain('Close', findRichText: true), findsOneWidget);
/// expect(find.textContain(RegExp(r'(\w+)'), findRichText: true), findsOneWidget);
/// ```
/// (Omitted)
///
Finder textContaining(
Pattern pattern, {
bool findRichText = false,
bool skipOffstage = true,
}) {flutter doctor -v
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