maint/util ~ (run-gnu-tests/docs) fix incorrect comment
# `run-gnu-test.bash [TEST]`
# run GNU test (or all tests if TEST is missing/null)
#
-# UU_MAKE_PROFILE == 'debug' | 'release' ## build profile used for *uutils* build; may be supplied by caller, defaults to 'debug'
+# UU_MAKE_PROFILE == 'debug' | 'release' ## build profile used for *uutils* build; may be supplied by caller, defaults to 'release'
# spell-checker:ignore (env/vars) GNULIB SRCDIR SUBDIRS ; (utils) shellcheck
