The curl examples have done the same thing as the most recent batch of API endpoints that were added to helix and used, long form headers which is inconsistent with the rest of the API documentation
curl --location --request GET 'https://api.twitch.tv/helix/channel_points/custom_rewards?broadcaster_id=274637212&id=92af127c-7326-4483-a52b-b0da0be61c01' \
--header 'client-id: gx2pv4208cff0ig9ou7nk3riccffxt' \
--header 'Authorization: Bearer vjxv3i0l4zxru966wsnwji51tmpkj2'
curl -H 'Client-ID: uo6dggojyb8d6soh92zknwmi5ej1q2' \
-H 'Authorization: Bearer cfabdegwdoklmawdzdo98xt2fo512y' \
-X GET 'https://api.twitch.tv/helix/analytics/extensions?type=overview_v1&extension_id=abcdefgh&started_at=2018-03-01T00:00:00Z&ended_at=2018-05-01T00:00:00Z'
A more of a general issue as docs should be consistent with the examples across the board
We'll make these consistent. Thanks for the note!