added descriptions

Author: irynaharoshka

common.yml

@@ -34,7 +34,7 @@ components:
       in: query
       name: tag
       required: true
-      description: "TBD"
+      description: "A unique tag associated with a liveness transaction session. Used to identify and delete the corresponding transaction."
       schema:
         type: string
 

liveness.yml

@@ -37,8 +37,8 @@ paths:
         - $ref: "./common.yml#/components/parameters/tag"
       tags:
         - liveness 2.0
-      summary: TBD
-      description: TBD
+      summary: Delete liveness transaction
+      description: "This endpoint deletes a liveness transaction based on either the specified `tag` or `transactionId`. At least one of the parameters must be provided for the operation to be valid."
       operationId: delete_liveness_transaction
       responses:
         204: