bpo-35755: Don't say "to mimick Unix which command behavior" (GH-12861)

diff --git a/Lib/distutils/spawn.py b/Lib/distutils/spawn.py
index 8883272..d3a12c2 100644
--- a/Lib/distutils/spawn.py
+++ b/Lib/distutils/spawn.py
@@ -188,7 +188,7 @@
                 # os.confstr() or CS_PATH is not available
                 path = os.defpath
         # bpo-35755: Don't use os.defpath if the PATH environment variable is
-        # set to an empty string to mimick Unix which command behavior
+        # set to an empty string
 
     # PATH='' doesn't match, whereas PATH=':' looks in the current directory
     if not path: