[ReleasePR datamigration] datamigration readme t2 config (#1559)

Create to sync Azure/azure-rest-api-specs#13494
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/master...AzureSDKAutomation:sdkAuto/datamigration?expand=1)

Author: msftbot[bot]

schemas/2017-11-15-preview/Microsoft.DataMigration.json

@@ -891,4 +891,4 @@
       "description": "Information for connecting to SQL database server"
     }
   }
-}
+}

schemas/2018-03-15-preview/Microsoft.DataMigration.json

@@ -1189,4 +1189,4 @@
       "description": "Properties for task that validates migration input for SQL to Azure SQL Database Managed Instance"
     }
   }
-}
+}

schemas/2018-03-31-preview/Microsoft.DataMigration.json

@@ -1242,4 +1242,4 @@
       "description": "Properties for task that validates migration input for SQL to Azure SQL Database Managed Instance"
     }
   }
-}
+}

schemas/2018-04-19/Microsoft.DataMigration.json

@@ -2782,4 +2782,4 @@
       "description": "Input for task that validates migration input for SQL sync migrations"
     }
   }
-}
+}

schemas/2018-07-15-preview/Microsoft.DataMigration.json

@@ -4344,4 +4344,4 @@
       "description": "Input for task that validates migration input for SQL sync migrations"
     }
   }
-}
+}