Changes to Update a post by slug

added the new optional request property canonicalUrl

added the new optional request property communityId

added the new optional request property publishOnline

added the new optional request property imageAlt

added the new optional request property authorIds

added the new optional request property bodyJson

added the non-success response with the status 409

added the new optional request property clearImage

added the new optional request property imageUrl

removed the optional property error from the response with the 400 status

removed the optional property error from the response with the 401 status

removed the optional property error from the response with the 404 status

removed the optional property error from the response with the 500 status

added the new optional request property publishedAt

added the new optional request property scheduledAt

added the new optional request property sendNewsletter

endpoint added