Add docs on Bearing2D.jl

[dehann]

closes:

• Better document bearing-only measurement tangent #731

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.36%. Comparing base (f7347f4) to head (b6e374e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #732   +/-   ##
=======================================
  Coverage   46.36%   46.36%           
=======================================
  Files          56       56           
  Lines        2338     2338           
=======================================
  Hits         1084     1084           
  Misses       1254     1254           

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