libc: fix description issues in mac_text(3)/mac_free(3)HEADmain

mac_text(3) as-written would seem to indicate that a `mac_t` should be
freed with free(3), but this isn't the case.  One can derive from
context from when the change was introduced and COMPATIBILITY that this
was intended to talk about *text in `mac_to_text`, so move the comment
there.

PR:		179832
Co-authored-by:	Priit Järv <priit cc ttu ee>
MFC after:	3 days

0 files changed, 0 insertions, 0 deletions