Doc/temporal clustering

[apigott]

Adds an explanation of the field entries for temporal clustering (how to use H and SEG units)

Changes proposed in this Pull Request

Checklist

Required:

• Changes are tested locally and behave as expected.
• Code and workflow changes are documented.
• A release note entry is added to doc/release_notes.rst.

If applicable:

• Changes in configuration options are reflected in scripts/lib/validation.
• For new data sources or versions, these instructions have been followed.
• New rules are documented in the appropriate doc/*.rst files.

[fneum]

Could you cherry-pick your commit 829d3fc and put it on top of the upstream master?

[fneum]

Thanks!

[fneum]

Sorry, that was also a bit of an oversight on my side. The config/schema.default.json is not supposed to be edited. Changes should be done here where they will material in the config.default.yaml and abovementioned schema file.