improve comment doc in tabs.dart (#140568)
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*List which issues are fixed by this PR. You must list at least one issue. An issue is not required if the PR fixes something trivial like a typo.*
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diff --git a/packages/flutter/lib/src/material/tabs.dart b/packages/flutter/lib/src/material/tabs.dart
index 3d1db68..dfa3e66 100644
--- a/packages/flutter/lib/src/material/tabs.dart
+++ b/packages/flutter/lib/src/material/tabs.dart
@@ -1025,7 +1025,7 @@
/// tabs with only icon or text, this padding is vertically
/// adjusted to provide uniform padding to all tabs.
///
- /// If this property is null, then kTabLabelPadding is used.
+ /// If this property is null, then [kTabLabelPadding] is used.
final EdgeInsetsGeometry? labelPadding;
/// Defines the ink response focus, hover, and splash colors.
