An error occurred
* add api user guides in doc * update user-guides api page * fix typo: user guides -> user guide * move api-usage page under advanced category * flesh out API usage docs * Build on work by @tungsheng * Address issues raised in #4037 An error occurred , #3673 An error occurred , and #4243 An error occurred * Close #4247 An error occurred Signed-off-by: Steve Traugott <stevegt@t7a.org>
stevegt