The `/session` endpoint left experimental in API V1.39 through
239047c2d3 and
01c9e7082e, but the API reference
was not updated accordingly.
This updates the API documentation to match the change.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 6756f5f378)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>