Syn3x datamodel

[therealsilence]

• Revise 'Data Model' section of User Guide

  • Account for 3x changes
  • General cleanup / clarification

• Update Glossary

  • Add / update terms related to Data Model
  • One-off revisions / clarifications

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.46%. Comparing base (309076d) to head (7c9e177).

Additional details and impacted files

@@             Coverage Diff              @@
##           synapse-3xx    #4803   +/-   ##
============================================
  Coverage        96.46%   96.46%           
============================================
  Files              256      256           
  Lines            62472    62472           
============================================
  Hits             60266    60266           
  Misses            2206     2206           

Flag	Coverage Δ
linux	96.46% <ø> (ø)

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