[Docs] update addXYZ functions

[Blargian]

Closes #2273 as part of the functions project to document all missing functions and/or update functions with insufficient documentation.

This PR either adds or updates:

• addDays
• addHours
• addInterval
• addMicroseconds
• addMilliseconds
• addMinutes
• addMonths
• addNanoseconds
• addQuarters
• addSeconds
• addTupleOfIntervals
• addWeeks
• addYears

Changelog category (leave one):

• Documentation (changelog entry is not required)

[robot-clickhouse-ci-2]

This is an automated comment for commit 2f32315 with description of existing statuses. It's updated for the latest CI running

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[Blargian]

I'll fix the relevant parts of subtractXYZ quick - they suffer from the same symptoms.