Add extended model docs (SYN-4239)

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Base: 97.19% // Head: 97.08% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (a1e67db) compared to base (59b245f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2904      +/-   ##
==========================================
- Coverage   97.19%   97.08%   -0.12%     
==========================================
  Files         215      215              
  Lines       42065    42050      -15     
==========================================
- Hits        40886    40825      -61     
- Misses       1179     1225      +46     

Flag	Coverage Δ
linux	97.08% <ø> (-0.01%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/tests/utils.py	94.46% <0.00%> (-1.89%)	⬇️
synapse/cortex.py	96.71% <0.00%> (-0.58%)	⬇️
synapse/lib/hiveauth.py	96.01% <0.00%> (-0.48%)	⬇️
synapse/lib/trigger.py	94.98% <0.00%> (-0.39%)	⬇️
synapse/lib/view.py	97.00% <0.00%> (-0.34%)	⬇️
synapse/cmds/cron.py	97.56% <0.00%> (-0.25%)	⬇️
synapse/lib/jsonstor.py	98.32% <0.00%> (-0.24%)	⬇️
synapse/lib/lmdbslab.py	99.53% <0.00%> (-0.19%)	⬇️
synapse/axon.py	98.73% <0.00%> (-0.15%)	⬇️
synapse/lib/layer.py	96.99% <0.00%> (-0.05%)	⬇️
... and 10 more

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