Delete bad action execution comment, write BES "exit code" warning comment

Minor cleanups.

RELNOTES: None.
PiperOrigin-RevId: 298648964
diff --git a/src/main/java/com/google/devtools/build/lib/actions/ActionExecutedEvent.java b/src/main/java/com/google/devtools/build/lib/actions/ActionExecutedEvent.java
index 895b3d01..ecc6c28 100644
--- a/src/main/java/com/google/devtools/build/lib/actions/ActionExecutedEvent.java
+++ b/src/main/java/com/google/devtools/build/lib/actions/ActionExecutedEvent.java
@@ -167,6 +167,10 @@
             .setType(action.getMnemonic());
 
     if (exception != null && exception.getExitCode() != null) {
+      // TODO(b/150405553): This statement seems to be confused. The exit_code field of
+      //  ActionExecuted is documented as "The exit code of the action, if it is available."
+      //  However, the value returned by exception.getExitCode().getNumericExitCode() is intended as
+      //  an exit code that this Bazel invocation might return to the user.
       actionBuilder.setExitCode(exception.getExitCode().getNumericExitCode());
     }
     if (stdout != null) {
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java
index 2789396..dffc60a 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java
@@ -1218,7 +1218,6 @@
           }
         }
 
-        // Success in execution but failure in completion.
         reportActionExecution(
             eventHandler,
             primaryOutputPath,