Tests: Amend the comment for TESTED_FILES

Arguably, this is easier.

tests/test_evals.py

@@ -12,12 +12,8 @@ XY = f'{sys.version_info[0]}{sys.version_info[1]}'
 # Handy environment variable you can use to run the tests
 # with modified macros files. Multiple files should be
 # separated by colon.
-# To get 'em all, run:
-# ls -1 macros.* | tr "\n" ":"
-# and then:
-# TESTED_FILES="<output of previous command>" pytest -v
-# or both combined:
-# TESTED_FILES=$(ls -1 macros.* | tr "\n" ":") pytest -v
+# You can use * if you escape it from your Shell:
+# TESTED_FILES='macros.*' pytest -v
 # Remember that some tests might need more macros files than just
 # the local ones.
 TESTED_FILES = os.getenv("TESTED_FILES", None)