Update documentation

Signed-off-by: Vitor Mattos <[email protected]>

site/.vuepress/public/specs/api.yaml

@@ -1410,6 +1410,17 @@ paths:
                               format: email
                               description: Unique email to identify signer. This property will only exist when it is a request made by the person who requested the document to be signed.
                               example: [email protected]
+                            identify-methods:
+                              type: object
+                              properties:
+                                method:
+                                  type: string
+                                  example: account
+                                  description: The identify method name
+                                value:
+                                  type: string
+                                  example: signer1
+                                  description: The value that identify the signer in the authentication method
                             uid:
                               type: string
                               description: Nextcloud user id of who requested the file to be signed.