Make docs.ms link relative link (#3221)

https://raw.githubusercontent.com/Azure/azure-docs-sdk-java/main/docs-ref-services/preview/sdk-template-readme.md

Metadata definition: https://review.docs.microsoft.com/en-us/help/contribute/metadata-attributes?branch=main

eng/common/scripts/Update-DocsMsMetadata.ps1

@@ -129,13 +129,12 @@ author: $author
 ms.author: $msauthor
 ms.date: $date
 ms.topic: reference
-ms.prod: azure
-ms.technology: azure
 ms.devlang: $Language
 ms.service: $service
 ---
 "@
 
+  $ReadmeContent = $ReadmeContent -replace "https://docs.microsoft.com(/en-us)?/?", "/"
   return "$header`n$ReadmeContent"
 }