diff --git a/build-system/linux-pr-validation.yaml b/build-system/linux-pr-validation.yaml
deleted file mode 100644
index 164e838e360..00000000000
--- a/build-system/linux-pr-validation.yaml
+++ /dev/null
@@ -1,22 +0,0 @@
-# Pull request validation for Linux against the `dev` and `master` branches
-# See https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema for reference
-trigger:
-  branches:
-    include:
-      - dev
-      - master
-
-name: $(Year:yyyy).$(Month).$(DayOfMonth)$(Rev:.r)
-
-pr:
-  autoCancel: true # indicates whether additional pushes to a PR should cancel in-progress runs for the same PR. Defaults to true
-  branches:
-    include: [ dev, master ] # branch names which will trigger a build
-
-jobs:
-- template: azure-pipeline.template.yaml
-  parameters:
-    name: Ubuntu
-    vmImage: 'ubuntu-18.04'
-    scriptFileName: ./build.sh
-    scriptArgs: all
\ No newline at end of file
diff --git a/build-system/pr-validation.yaml b/build-system/pr-validation.yaml
index be9275510d9..5c603e3db98 100644
--- a/build-system/pr-validation.yaml
+++ b/build-system/pr-validation.yaml
@@ -37,7 +37,7 @@ jobs:
   - job: DocsMarkdownLinting
     displayName: "Docs: Markdown Linting"
     pool:
-      vmImage: ubuntu-20.04
+      vmImage: ubuntu-latest
     steps:
       - checkout: self # self represents the repo where the initial Pipelines YAML file was found
         clean: false # whether to fetch clean each time
@@ -118,7 +118,7 @@ jobs:
     parameters:
       name: "net_core_tests_linux"
       displayName: ".NET Core Unit Tests (Linux)"
-      vmImage: "ubuntu-18.04"
+      vmImage: "ubuntu-latest"
       scriptFileName: "./build.sh"
       scriptArgs: runTestsNetCore incremental
       outputDirectory: "TestResults"
@@ -149,7 +149,7 @@ jobs:
     parameters:
       name: "net_6_tests_linux"
       displayName: ".NET 6 Unit Tests (Linux)"
-      vmImage: "ubuntu-18.04"
+      vmImage: "ubuntu-latest"
       scriptFileName: "./build.sh"
       scriptArgs: runTestsNet incremental
       outputDirectory: "TestResults"
@@ -187,4 +187,4 @@ jobs:
       scriptFileName: build.cmd
       scriptArgs: CreateNuget nugetprerelease=dev incremental
       outputDirectory: "bin/nuget"
-      artifactName: "nuget_pack-$(Build.BuildId)"
+      artifactName: "nuget_pack-$(Build.BuildId)"
\ No newline at end of file
diff --git a/src/core/Akka/ActorState.cs b/src/core/Akka/ActorState.cs
index 13ec044d157..6fc8666ddba 100644
--- a/src/core/Akka/ActorState.cs
+++ b/src/core/Akka/ActorState.cs
@@ -430,7 +430,7 @@ public IActorState RemoveWatchedBy(IActorRef actor)
         }
 
         /// <summary>
-        /// TBD
+        /// Removes a terminated actor
         /// </summary>
         /// <param name="actor">TBD</param>
         /// <returns>TBD</returns>