Address PR feedback: trim and prefix issue-1493 comments

Author: tillig

src/Autofac/Core/Resolving/Pipeline/ResolvePipelineBuilder.cs

@@ -160,11 +160,10 @@ private static Action<ResolveRequestContext> BuildMetricsMiddlewareChain(Action<
         var stagePhase = stage.Phase;
         var stageName = stage.ToString()!;
 
-        // Metrics are captured around each stage execution while preserving
-        // diagnostics callbacks (if enabled for the current request). This lambda
-        // must only close over build-time state (next, stage, stagePhase, stageName)
-        // so it is allocated once per pipeline build rather than once per resolve.
-        // See issue #1493.
+        // Metrics are captured around each stage execution while preserving diagnostics
+        // callbacks (if enabled for the current request). Issue 1493: this lambda must
+        // only close over build-time state so it is allocated once per pipeline build
+        // rather than once per resolve.
         return context =>
         {
             if (!context.DiagnosticSource.IsEnabled())
@@ -218,9 +217,9 @@ private static Action<ResolveRequestContext> BuildStandardMiddlewareChain(Action
     {
         var stagePhase = stage.Phase;
 
-        // Hot path when execution metrics are disabled. This lambda must only close
-        // over build-time state (next, stage, stagePhase) so it is allocated once per
-        // pipeline build rather than once per resolve. See issue #1493.
+        // Hot path when execution metrics are disabled. Issue 1493: this lambda must only
+        // close over build-time state so it is allocated once per pipeline build rather
+        // than once per resolve.
         return context =>
         {
             // Same basic flow in if/else, but doing a one-time check for diagnostics

test/Autofac.Test/Core/Pipeline/PipelineBuilderTests.cs

@@ -425,11 +425,8 @@ public void CannotAddBadPhaseToPipelineInUseRangeExistingMiddleware()
         }));
     }
 
-    // Regression test for https://github.com/autofac/Autofac/issues/1493. In 9.2 the
-    // built middleware chain wrapped each stage in a lambda that captured the
-    // per-invocation ResolveRequestContext, so a fresh closure was allocated for every
-    // stage on every resolve. The built pipeline should close only over build-time
-    // state, so invoking it must not allocate on the hot path.
+    // Issue 1493: a built pipeline must close only over build-time state, so invoking it
+    // must not allocate a per-invocation closure for each middleware stage on the hot path.
     [Fact]
     public void InvokingBuiltPipelineDoesNotAllocatePerInvocation()
     {