Update markdown link check workflow to allow all branches for pull requests and fix JSON formatting in release notes

Author: jamesmontemagno

.github/workflows/markdown-link-check.yml

@@ -5,7 +5,7 @@ on:
     paths:
       - '**.md'
   pull_request:
-    branches: [main]
+    branches: '**'
     paths:
       - '**.md'
 

release-notes/10.0/releases.json

@@ -8,7 +8,7 @@
   "release-type": "lts",
   "lifecycle-policy": "https://aka.ms/dotnetcoresupport",
   "releases": [
-        {
+    {
       "release-date": "2025-11-11",
       "release-version": "10.0.0-preview.7",
       "security": false,