Fix DartDoc section in Diagnostics server for LSP

Change-Id: I8bb40a08b7b6aa53c962bc5a86eb3e68a330a87c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/102620
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Danny Tuppeny <dantup@google.com>
diff --git a/pkg/analysis_server/lib/src/status/diagnostics.dart b/pkg/analysis_server/lib/src/status/diagnostics.dart
index 2723c18..a03964c 100644
--- a/pkg/analysis_server/lib/src/status/diagnostics.dart
+++ b/pkg/analysis_server/lib/src/status/diagnostics.dart
@@ -551,9 +551,9 @@
     }
 
     h3('Dartdoc template info');
-    DartdocDirectiveInfo info = (server as AnalysisServer).declarationsTracker
-        ?.getContext(driver.analysisContext)
-        ?.dartdocDirectiveInfo ??
+    DartdocDirectiveInfo info = server.declarationsTracker
+            ?.getContext(driver.analysisContext)
+            ?.dartdocDirectiveInfo ??
         new DartdocDirectiveInfo();
     writeMap(info.templateMap);
   }