Add manual merge instructions to eng/common workflow (#16971)
Add manual merge instructions to eng/common workflow (#16971)

Co-authored-by: Mike Harder <e82d596b0147d33fa1b3f237a7df5c6935399c0f@microsoft.com>
Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java