Comment out unused XorTMonadCombine

[ceedubs]

This trait is currently unused, because the implicit def that uses it is
commented out until we have separated weak/strong laws for MonadCombine. We probably shouldn't expose it if it doesn't satisfy our current MonadCombine laws.

[codecov-io]

Current coverage is 83.76%

Merging #687 into master will not affect coverage as of 7a737fe

@@            master    #687   diff @@
======================================
  Files          162     162       
  Stmts         2217    2217       
  Branches        74      74       
  Methods          0       0       
======================================
  Hit           1857    1857       
  Partial          0       0       
  Missed         360     360       

Review entire Coverage Diff as of 7a737fe

Powered by Codecov. Updated on successful CI builds.

[non]

👍

[adelbertc]

👍