C#: Fix casing of "CodeQL Action"

Author: henrymercer

csharp/autobuilder/Semmle.Autobuild.CSharp/CSharpDiagnosticClassifier.cs

@@ -84,8 +84,8 @@ public Result()
                 This may lead to subsequent failures. You can check for common causes for missing project files:
 
                 - Ensure that the project is built using the {runsOnDocsUrl.ToMarkdownLink("intended operating system")} and that filenames on case-sensitive platforms are correctly specified.
-                - If your repository uses Git submodules, ensure that those are {checkoutDocsUrl.ToMarkdownLink("checked out")} before the CodeQL action is run.
-                - If you auto-generate some project files as part of your build process, ensure that these are generated before the CodeQL action is run.
+                - If your repository uses Git submodules, ensure that those are {checkoutDocsUrl.ToMarkdownLink("checked out")} before the CodeQL Action is run.
+                - If you auto-generate some project files as part of your build process, ensure that these are generated before the CodeQL Action is run.
                 """
             );
         }

csharp/ql/integration-tests/all-platforms/diag_missing_project_files/diagnostics.expected

@@ -19,7 +19,7 @@
   "attributes": {},
   "helpLinks": [],
   "internal": false,
-  "markdownMessage": "Some project files were not found when CodeQL built your project:\n\n- `Example.csproj`\n- `Example.Test.csproj`\n\nThis may lead to subsequent failures. You can check for common causes for missing project files:\n\n- Ensure that the project is built using the [intended operating system](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idruns-on) and that filenames on case-sensitive platforms are correctly specified.\n- If your repository uses Git submodules, ensure that those are [checked out](https://github.com/actions/checkout#usage) before the CodeQL action is run.\n- If you auto-generate some project files as part of your build process, ensure that these are generated before the CodeQL action is run.",
+  "markdownMessage": "Some project files were not found when CodeQL built your project:\n\n- `Example.csproj`\n- `Example.Test.csproj`\n\nThis may lead to subsequent failures. You can check for common causes for missing project files:\n\n- Ensure that the project is built using the [intended operating system](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idruns-on) and that filenames on case-sensitive platforms are correctly specified.\n- If your repository uses Git submodules, ensure that those are [checked out](https://github.com/actions/checkout#usage) before the CodeQL Action is run.\n- If you auto-generate some project files as part of your build process, ensure that these are generated before the CodeQL Action is run.",
   "severity": "error",
   "source": {
     "extractorName": "csharp",