Changes to Update an existing page

added the new optional request property designVersion

added the new optional request property theme

added the new optional request property themeTokens

added the non-success response with the status 400

added the optional property ignoredTokens to the response with the 200 status

added the required property designVersion to the response with the 200 status

added the new image/svg+xml enum value to the request property contentType

added the media type application/json for the response with the status 200

added the media type application/json for the response with the status 404

added the media type application/json for the response with the status 413

added the new optional request property key

endpoint added