Ensure `environment` keyword is defined on all `deploy` jobs in documentation (batch 1)

See Ensure `environment` keyword is defined on all ... (&8590 - closed) for more details

Implementation guide

Make sure that all stage: deploy jobs in the following documentation files are already have environment: keyword.

If some of them don't, then add the

environment: production

(substitute production to other environmens like dev or staging where it makes more sense).

doc/ci/cloud_deployment/index.md
48:  stage: deploy

doc/ci/resource_groups/index.md
29:  stage: deploy
117:  stage: deploy
169:  stage: deploy
188:  stage: deploy
224:  stage: deploy
250:  stage: deploy

doc/ci/triggers/index.md
86:  stage: deploy

doc/ci/environments/protected_environments.md
65:     stage: deploy

doc/ci/environments/deployment_approvals.md
46:     stage: deploy