Add snapshot testing note to GLFM docs
What does this MR do and why?
Related: Tracking Issue: Implement GLFM scripts per the ... (#361241 - closed)
Adds note about nature and intention of snapshot testing to https://docs.gitlab.com/ee/development/gitlab_flavored_markdown/specification_guide/#markdown-snapshot-testing
Completes task in #361241 (closed)
References
See the GLFM Specification Guide development documentation for much more context on all of this work: https://docs.gitlab.com/ee/development/gitlab_flavored_markdown/specification_guide
MR acceptance checklist
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