* Reordered the settings relevant without stream creation to the top.
* Removed useless/misleading defaults for optional parameters.
* Clarified description of the announce and authorization_errors_fatal settings.
* Clarified that `invite_only` only applies for stream creation.
(It's annoying to do so for its friends because they are including
common description content and OpenAPI doesn't have a way to have
extra content in a place you included something)
Fixes#14705.
api docs filenames are basically the operationId of their endpoint
in zulip.yaml with `_` replaced by `-`. But some operationIds have
changed, so change the affected filenames. Make changes in other
files accordingly.
The term `parameter` is a better word than `argument` for data passed
to an API endpoint; this is why OpenAPI uses in their terminology.
Replace `argument` with `parameter` in the API docs to improve their
readability.
Fixes#15435.