[4.6] Link deprecation docs pytest.raises 'message' warning

[asottile]

#5421

[codecov]

Codecov Report

Merging #5425 into 4.6-maintenance will increase coverage by 0.26%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##           4.6-maintenance    #5425      +/-   ##
===================================================
+ Coverage            95.91%   96.17%   +0.26%     
===================================================
  Files                  115      115              
  Lines                26407    26407              
  Branches              2609     2609              
===================================================
+ Hits                 25328    25398      +70     
+ Misses                 755      703      -52     
+ Partials               324      306      -18

Impacted Files	Coverage Δ
src/_pytest/deprecated.py	100% <ø> (ø)	⬆️
src/_pytest/fixtures.py	97.55% <0%> (+0.27%)	⬆️
testing/test_capture.py	99.25% <0%> (+0.29%)	⬆️
testing/test_terminal.py	99.84% <0%> (+0.31%)	⬆️
testing/test_config.py	99.83% <0%> (+0.33%)	⬆️
testing/test_pdb.py	99.22% <0%> (+0.38%)	⬆️
src/_pytest/pytester.py	91.66% <0%> (+0.42%)	⬆️
src/_pytest/assertion/rewrite.py	95.77% <0%> (+0.48%)	⬆️
testing/python/fixtures.py	99.09% <0%> (+0.56%)	⬆️
src/_pytest/junitxml.py	95.9% <0%> (+0.58%)	⬆️
... and 10 more

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