Update CI/CD "Secret Variables" to "Variables" across documentation
The CI/CD "Variables" documentation is still using the old term "Secret Variables in many places,
-
https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/ci/variables/README.md has a screen shot that says "Secret Variables" - this panel has been renamed to "Variables" -
https://docs.gitlab.com/ee/ci/examples/deployment/composer-npm-deploy.html#how-to-transfer-files-to-a-live-server : 'Secret Variable' could eventually be renamed in 'Protected Variable' -
https://docs.gitlab.com/ee/topics/autodevops/index.html#deploy-policy-for-staging-and-production-environments contains 5 occurrences of the expression 'secret variable' -
https://docs.gitlab.com/runner/configuration/advanced-configuration.html#using-a-private-container-registry has a reference to the concept of secret variable, as well as an incorrect link to the documentation, linking to https://docs.gitlab.com/ce/ci/variables/#secret-variables
instead ofhttps://docs.gitlab.com/ce/ci/variables/#variables