Optimize constructor links

[tristanlatr]

Fix #786

[codecov]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 92.60%. Comparing base (936db93) to head (7ec24e9).

Files	Patch %	Lines
pydoctor/epydoc2stan.py	88.23%	1 Missing and 1 partial ⚠️
pydoctor/model.py	93.33%	0 Missing and 1 partial ⚠️
pydoctor/templatewriter/pages/__init__.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #787      +/-   ##
==========================================
- Coverage   92.64%   92.60%   -0.04%     
==========================================
  Files          47       47              
  Lines        8384     8389       +5     
  Branches     1848     1850       +2     
==========================================
+ Hits         7767     7769       +2     
- Misses        355      356       +1     
- Partials      262      264       +2     

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[github-actions]

According to pydoctor_primer, this change doesn't affect pydoctor warnings on a corpus of open source code. ✅