Update `unittest.bash` documentation not to mention `--test_arg` in favor of `--test_filter`.
# respectively. Similarly, "cleanup" and "timeout" may be redefined,
# and these function are called upon exit (of any kind) or a timeout.
#
-# The user can pass --test_arg to blaze test to select specific tests
-# to run. Specifying --test_arg multiple times allows to select several
-# tests to be run in the given order. Additionally the user may define
-# TESTS=(test_foo test_bar ...) to specify a subset of test functions to
-# execute, for example, a working set during debugging. By default, all
-# functions called test_* will be executed.
+# The user can pass --test_filter to blaze test to select specific tests
+# to run with Bash globs. A union of tests matching any of the provided globs
+# will be run. Additionally the user may define TESTS=(test_foo test_bar ...) to
+# specify a subset of test functions to execute, for example, a working set
+# during debugging. By default, all functions called test_* will be executed.
#
# This file provides utilities for assertions over the output of a
# command. The output of the command under test is directed to the
