Add some hive API docstrings.

[vEpiphyte]

No description provided.

[codecov]

Codecov Report

Merging #1285 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #1285      +/-   ##
=========================================
+ Coverage   94.76%   94.8%   +0.03%     
=========================================
  Files         122     122              
  Lines       15102   15102              
=========================================
+ Hits        14312   14318       +6     
+ Misses        790     784       -6

Impacted Files	Coverage Δ
synapse/lib/hive.py	96.61% <ø> (ø)	⬆️
synapse/lib/lmdbslab.py	98.83% <0%> (+0.19%)	⬆️
synapse/lib/thisplat.py	66.66% <0%> (+8.33%)	⬆️
synapse/lib/platforms/darwin.py	100% <0%> (+100%)	⬆️

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