Fix link not found line numbers

[tristanlatr]

• Fix Regression on in link not found warnings linenumbers #745

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (922f81e) 92.69% compared to head (a15d419) 92.69%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #748   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
=======================================
  Files          47       47           
  Lines        8284     8285    +1     
  Branches     1824     1826    +2     
=======================================
+ Hits         7679     7680    +1     
  Misses        347      347           
  Partials      258      258           

Files	Coverage Δ
pydoctor/linker.py	90.20% <100.00%> (+0.06%)	⬆️

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