Change link to dsl-domains-cats instead of Dsl.scala

[Atry]

Since dsl-domains-cats is now separated from Dsl.scala repository.

[codecov-io]

Codecov Report

Merging #2909 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2909      +/-   ##
==========================================
- Coverage   94.26%   94.24%   -0.03%     
==========================================
  Files         363      363              
  Lines        6945     6945              
  Branches      181      181              
==========================================
- Hits         6547     6545       -2     
- Misses        398      400       +2

Impacted Files	Coverage Δ
testkit/src/main/scala/cats/tests/Helpers.scala	96% <0%> (-4%)	⬇️
...cala/cats/kernel/instances/FunctionInstances.scala	96.96% <0%> (-3.04%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ae67418...c4e3936. Read the comment docs.