Risk model docstrings

[therealsilence]

• Update docstrings for risk:* model to clarify use.
• Update links in various intro docs.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.11 ⚠️

Comparison is base (45b89c3) 97.19% compared to head (49db123) 97.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3027      +/-   ##
==========================================
- Coverage   97.19%   97.09%   -0.11%     
==========================================
  Files         221      221              
  Lines       43659    43659              
==========================================
- Hits        42436    42391      -45     
- Misses       1223     1268      +45     

Flag	Coverage Δ
linux	97.09% <ø> (ø)
linux_replay	?

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

Impacted Files	Coverage Δ
synapse/models/risk.py	100.00% <ø> (ø)
synapse/tests/utils.py	94.49% <0.00%> (-1.88%)	⬇️
synapse/cortex.py	96.72% <0.00%> (-0.56%)	⬇️
synapse/lib/hiveauth.py	96.01% <0.00%> (-0.48%)	⬇️
synapse/lib/oauth.py	98.68% <0.00%> (-0.44%)	⬇️
synapse/lib/trigger.py	95.01% <0.00%> (-0.39%)	⬇️
synapse/lib/view.py	97.02% <0.00%> (-0.34%)	⬇️
synapse/lib/jsonstor.py	98.32% <0.00%> (-0.24%)	⬇️
synapse/axon.py	98.47% <0.00%> (-0.14%)	⬇️
synapse/lib/layer.py	96.60% <0.00%> (-0.04%)	⬇️

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