Supply operationId with freshly added operations

Signed-off-by: Alexey Rusakov <ktirf@users.sf.net>

api/client-server/content-repo.yaml

@@ -217,6 +217,7 @@ paths:
   "/preview_url":
     get:
       summary: "Get information about a URL for a client"
+      operationId: getUrlPreview
       produces: ["application/json"]
       security:
         - accessToken: []

api/client-server/whoami.yaml

@@ -30,6 +30,7 @@ paths:
       summary: Gets information about the owner of an access token.
       description: |-
         Gets information about the owner of a given access token.
+      operationId: getTokenOwner
       security:
         - accessToken: []
       parameters: []