CI: {caching,test}: upd commets

This should short-cirquit.

Author: Anton-Latukha

.github/workflows/caching.yml

@@ -101,8 +101,9 @@ jobs:
         name: (GHC 9.0.1) Use modified `cabal.project`
         run: |
           # File has some protections preventing regular `rm`.
-          # `&&` insures `rm -f` returns positive.
-          # Some platforms have `alias cp='cp -i'`.
+          # (most probably sticky bit is set on $HOME)
+          # `&&` insures `rm -f` return is positive.
+          # Many platforms aslo have `alias cp='cp -i'`.
           rm -f -v cabal.project && cp -v cabal-ghc901.project cabal.project
       - if: runner.os == 'Windows' && matrix.ghc == '8.8.4'
         name: (Windows,GHC 8.8) Modify `cabal.project` to workaround segfaults

.github/workflows/test.yml

@@ -96,8 +96,9 @@ jobs:
         name: (GHC 9.0.1) Use modified `cabal.project`
         run: |
           # File has some protections preventing regular `rm`.
-          # `&&` insures `rm -f` returns positive.
-          # Some platforms have `alias cp='cp -i'`.
+          # (most probably sticky bit is set on $HOME)
+          # `&&` insures `rm -f` return is positive.
+          # Many platforms aslo have `alias cp='cp -i'`.
           rm -f -v cabal.project && cp -v cabal-ghc901.project cabal.project
       - if: runner.os == 'Windows' && matrix.ghc == '8.8.4'
         name: (Windows,GHC 8.8) Modify `cabal.project` to workaround segfaults