CLOUDP-321939: Fix curl examples for POST/PU/PATCH

[andreaangiolillo]

Proposed changes

Jira ticket: CLOUDP-321939

Description

Bug

Doc team feedback: cURL commands for PUT, PATCH, and POST methods are not valid. Users receive errors if copying and pasting into terminal and replacing variables with their own data. Each command that uses these methods and requires a request body needs an extra \ after the endpoint URI in order for shells to handle the line break.

Fix

This PR adds an additional \ and update the payload from { <Payload> } to '{ <Payload> }' for PUT, PATCH, and POST.

You can check how this change renders in https://redocly.github.io/redoc/#tag/Projects/operation/createProject. Example:

curl --user "{PUBLIC-KEY}:{PRIVATE-KEY}" \
  --digest \
  --header "Accept: application/vnd.atlas.2025-01-01+json" \
  --header "Content-Type: application/vnd.atlas.2025-01-01+json" \
  -X POST "https://cloud.mongodb.com/api/atlas/v2/groups" \
  -d '{ <Payload> }'

[andreaangiolillo]

main change. The other files were regenerated for the e2e tests.