net-timestamp: correct the use of SOF_TIMESTAMPING_RAW_HARDWARE

SOF_TIMESTAMPING_RAW_HARDWARE is a report flag which passes the
timestamps generated by either SOF_TIMESTAMPING_TX_HARDWARE or
SOF_TIMESTAMPING_RX_HARDWARE to the userspace all the time.

So let us revise the doc here.

Link: https://lore.kernel.org/all/[email protected]/
Suggested-by: Willem de Bruijn <[email protected]>
Reviewed-by: Willem de Bruijn <[email protected]>
Signed-off-by: Jason Xing <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: JasonXing

Documentation/networking/timestamping.rst

@@ -158,7 +158,8 @@ SOF_TIMESTAMPING_SYS_HARDWARE:
 
 SOF_TIMESTAMPING_RAW_HARDWARE:
   Report hardware timestamps as generated by
-  SOF_TIMESTAMPING_TX_HARDWARE when available.
+  SOF_TIMESTAMPING_TX_HARDWARE or SOF_TIMESTAMPING_RX_HARDWARE
+  when available.
 
 
 1.3.3 Timestamp Options