Update diagnostics.dart

Sorry -- fixing a grammar nit. I know it's a tiny thing, but it bugs me!

Closes https://github.com/dart-lang/sdk/pull/47535
https://github.com/dart-lang/sdk/pull/47535

GitOrigin-RevId: 5b6ec7c1a521a923f156e21bbcc81348043f45b4
Change-Id: Iea8bd74e20705cada2519b35183556c79eb0d265
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/217821
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
diff --git a/pkg/analysis_server/lib/src/status/diagnostics.dart b/pkg/analysis_server/lib/src/status/diagnostics.dart
index 6b510af..629d626 100644
--- a/pkg/analysis_server/lib/src/status/diagnostics.dart
+++ b/pkg/analysis_server/lib/src/status/diagnostics.dart
@@ -949,7 +949,7 @@
 
     p('Other data to include:');
     ul([
-      "the IDE you are using and it's version${ideText.isEmpty ? '' : ' ($ideText)'}",
+      "the IDE you are using and its version${ideText.isEmpty ? '' : ' ($ideText)'}",
       'the Dart SDK version (<code>${escape(_sdkVersion)}</code>)',
       'your operating system (<code>${escape(Platform.operatingSystem)}</code>)',
     ], (line) => buf.writeln(line));