Fix #6474: DocFieldTransformer raises AttributeError

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• refs: AttributeError: 'DirectiveAdapter' object has no attribute 'get_field_type_map' since v2.1.0 #6474

[codecov]

Codecov Report

Merging #6624 into 2.0 will decrease coverage by <.01%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##              2.0    #6624      +/-   ##
==========================================
- Coverage   83.72%   83.72%   -0.01%     
==========================================
  Files         271      271              
  Lines       40952    40956       +4     
  Branches     5993     5993              
==========================================
+ Hits        34288    34289       +1     
- Misses       5337     5340       +3     
  Partials     1327     1327

Impacted Files	Coverage Δ
sphinx/util/docfields.py	87.81% <40%> (-1.31%)	⬇️

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