Correct file type from YAML to JSON

The YAML files referenced in a contextual TOC are published as JSON files, as I noted in AskAnAdmin. More info: https://review.learn.microsoft.com/en-us/help/platform/navigation-set-up-contextual-toc?branch=main#update-your-toc-file

Author: garycentric

defender-endpoint/TOC.yml

@@ -11,7 +11,7 @@
     - name: Trial user guide - Microsoft Defender for Endpoint
       href: defender-endpoint-trial-user-guide.md
     - name: Pilot and deploy Defender for Endpoint
-      href: /defender-xdr/pilot-deploy-defender-endpoint?toc=/defender-xdr/TOC.json&bc=/defender-xdr/breadcrumb/toc.yml
+      href: /defender-xdr/pilot-deploy-defender-endpoint?toc=/defender-xdr/TOC.json&bc=/defender-xdr/breadcrumb/toc.json
     - name: Minimum requirements
       href: minimum-requirements.md
     - name: Supported Microsoft Defender for Endpoint capabilities by platform

defender-office-365/TOC.yml

@@ -38,7 +38,7 @@
    - name: Deploy
      items: 
      - name: Pilot and deploy Defender for Office 365
-       href: /defender-xdr/pilot-deploy-defender-office-365?toc=/defender-xdr/TOC.json&bc=/defender-xdr/breadcrumb/toc.yml
+       href: /defender-xdr/pilot-deploy-defender-office-365?toc=/defender-xdr/TOC.json&bc=/defender-xdr/breadcrumb/toc.json
      - name: Get started with Microsoft Defender for Office 365
        href: mdo-deployment-guide.md
      - name: Step 1 - Configure email authentication