Update MD025/single-title and MD051/link-fragments to ignore headings that exactly match Docfx tab syntax (fixes #1099) (fixes #1101).

test/snapshots/markdownlint-test-scenarios.mjs.md

@@ -11348,6 +11348,54 @@ Generated by [AVA](https://avajs.dev).
       `,
     }
 
+## docfx-tab-syntax.md
+
+> Snapshot 1
+
+    {
+      errors: [],
+      fixed: `# Docfx Tab Syntax␊
+      ␊
+      Examples copied from: <https://dotnet.github.io/docfx/docs/markdown.html?tabs=linux%2Cdotnet#tabs>␊
+      ␊
+      ---␊
+      ␊
+      # [Tab Display Name](#tab/tab-id)␊
+      ␊
+      ---␊
+      ␊
+      # [Linux](#tab/linux)␊
+      ␊
+      Content for Linux...␊
+      ␊
+      # [Windows](#tab/windows)␊
+      ␊
+      Content for Windows...␊
+      ␊
+      ---␊
+      ␊
+      # [.NET](#tab/dotnet/linux)␊
+      ␊
+      .NET content for Linux...␊
+      ␊
+      # [.NET](#tab/dotnet/windows)␊
+      ␊
+      .NET content for Windows...␊
+      ␊
+      # [TypeScript](#tab/typescript/linux)␊
+      ␊
+      TypeScript content for Linux...␊
+      ␊
+      # [TypeScript](#tab/typescript/windows)␊
+      ␊
+      TypeScript content for Windows...␊
+      ␊
+      # [REST API](#tab/rest)␊
+      ␊
+      REST API content, independent of platform...␊
+      `,
+    }
+
 ## emoji-headings.md
 
 > Snapshot 1