✨ Extend c.this_doc() to all directives with filter option

[chrisjsewell]

extending #1393

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.24%. Comparing base (4e10030) to head (61e3e8e).
Report is 134 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1405      +/-   ##
==========================================
+ Coverage   86.87%   88.24%   +1.36%     
==========================================
  Files          56       60       +4     
  Lines        6532     7152     +620     
==========================================
+ Hits         5675     6311     +636     
+ Misses        857      841      -16     

Flag	Coverage Δ
pytests	88.24% <ø> (+1.36%)	⬆️

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