CI_COMMIT_MESSAGE regex examples in rules should not use prefix matching due to trailing new line

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Documentation can be improved by using more general examples, which do not fail to work. See pages regarding workflow:rules:

• https://docs.gitlab.com/ee/ci/yaml/index.html#workflowrules
• https://docs.gitlab.com/ee/ci/yaml/workflow.html#workflow-rules-examples

Here the default example for using CI_COMMIT_MESSAGE to much a suffix -draft is:

if: $CI_COMMIT_MESSAGE =~ /-draft$/

Due to the way how git commit -m my-draft works, it will add a trailing new line to the commit message, which is not obvious. Therefore, for a beginner to rules the above example will always fail to work. It would be more save to provide an example with a prefix notation, which will not fail to work in any environment:

if: $CI_COMMIT_MESSAGE =~ /^draft/