Docs: convert to ISO 8601

An attempt to convert cycle points and durations in docs to ISO 8601 syntax.
Yes. However, this is only a magical default. Most of our builds are placed in `share/` anyway. If a user writes a suite to run a magical `fcm_make*` task in cycle 2, then they can override the magical default with their own custom stuffs. Restricting the glob here makes sense as it should reduce the overheads for matching it.