phy: Fix kerneldoc alignment

Insert missing space in front of asterisk to avoid checkpatch warning.
Replace 'beeing' with 'being' as well, to fix another checkpatch warning.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>