Remove mention of "dartfmt" from analyzer README.

In Dart 2.15, we're removing "dartfmt" in favor of "dart format".

Change-Id: Id26b32872e72e97a45cfd1e28defea9adc38aa24
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/215183
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
diff --git a/pkg/analyzer/README.md b/pkg/analyzer/README.md
index f574d8c..d35c78b 100644
--- a/pkg/analyzer/README.md
+++ b/pkg/analyzer/README.md
@@ -70,7 +70,7 @@
 
 Many tools embed this library, such as:
 
-* [dartfmt] - a formatter for Dart code
+* [dart format] - a formatter for Dart code
 * [dartdoc] - a documentation generator for Dart code
 * [Dart Analysis Server][analysis_sever] - a stateful server that supports IDEs and editors
 
@@ -102,7 +102,7 @@
 [lintrules]: https://dart-lang.github.io/linter/lints/
 [glob]: https://pub.dev/packages/glob
 [LICENSE]: https://github.com/dart-lang/sdk/blob/main/pkg/analyzer/LICENSE
-[dartfmt]: https://github.com/dart-lang/dart_style
+[dart format]: https://github.com/dart-lang/dart_style
 [dartdoc]: https://github.com/dart-lang/dartdoc
 [analysis_sever]: https://github.com/dart-lang/sdk/tree/main/pkg/analysis_server
 [custom_analysis]: https://dart.dev/guides/language/analysis-options