Ensure `environment` keyword is defined on all `deploy` jobs in documentation (batch 2)

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/environments/index.md
73:     stage: deploy
97:  stage: deploy
155:  stage: deploy
200:  stage: deploy
426:  stage: deploy
435:  stage: deploy
471:  stage: deploy
481:  stage: deploy
531:  stage: deploy
539:  stage: deploy
728:  stage: deploy
987:    stage: deploy
994:    stage: deploy
1014:    stage: deploy

doc/ci/pipelines/multi_project_pipelines.md
59:  stage: deploy
105:  stage: deploy
138:  stage: deploy
213:     stage: deploy
250:     stage: deploy

doc/ci/pipelines/pipeline_architectures.md
83:  stage: deploy
89:  stage: deploy
149:  stage: deploy
156:  stage: deploy
236:  stage: deploy
265:  stage: deploy