Updating the documentation for hwtimestamp to match ethtool's output

Hello!

The documentation for 'hwtimestamp' (eg 
https://chrony.tuxfamily.org/doc/4.2/chrony.conf.html#hwtimestamp) 
includes this snippet regarding the capabilities that 'ethtool -T' 
should output:

---
The list of capabilities should include SOF_TIMESTAMPING_RAW_HARDWARE, 
SOF_TIMESTAMPING_TX_HARDWARE, and SOF_TIMESTAMPING_RX_HARDWARE. Receive 
filter HWTSTAMP_FILTER_ALL, or HWTSTAMP_FILTER_NTP_ALL, is necessary for 
timestamping of received NTP packets.
---

However "modern" ethtool only seems to output the "friendlier" labels -- 
here's the same model of NIC queried first using ethtool v4.19 then v5.9:


---
# ethtool --version
ethtool version 4.19

# ethtool -T ens1f0
Time stamping parameters for ens1f0:
Capabilities:
	hardware-transmit     (SOF_TIMESTAMPING_TX_HARDWARE)
	software-transmit     (SOF_TIMESTAMPING_TX_SOFTWARE)
	hardware-receive      (SOF_TIMESTAMPING_RX_HARDWARE)
	software-receive      (SOF_TIMESTAMPING_RX_SOFTWARE)
	software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
	hardware-raw-clock    (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
	off                   (HWTSTAMP_TX_OFF)
	on                    (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
	none                  (HWTSTAMP_FILTER_NONE)
	ptpv1-l4-event        (HWTSTAMP_FILTER_PTP_V1_L4_EVENT)
	ptpv1-l4-sync         (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)
	ptpv1-l4-delay-req    (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)
	ptpv2-l4-event        (HWTSTAMP_FILTER_PTP_V2_L4_EVENT)
	ptpv2-l4-sync         (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)
	ptpv2-l4-delay-req    (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)
	ptpv2-l2-event        (HWTSTAMP_FILTER_PTP_V2_L2_EVENT)
	ptpv2-l2-sync         (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)
	ptpv2-l2-delay-req    (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)
	ptpv2-event           (HWTSTAMP_FILTER_PTP_V2_EVENT)
	ptpv2-sync            (HWTSTAMP_FILTER_PTP_V2_SYNC)
	ptpv2-delay-req       (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)

---

# ethtool --version
ethtool version 5.9

# ethtool -T enp59s0f0
Time stamping parameters for enp59s0f0:
Capabilities:
	hardware-transmit
	software-transmit
	hardware-receive
	software-receive
	software-system-clock
	hardware-raw-clock
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
	off
	on
Hardware Receive Filter Modes:
	none
	ptpv1-l4-event
	ptpv1-l4-sync
	ptpv1-l4-delay-req
	ptpv2-l4-event
	ptpv2-l4-sync
	ptpv2-l4-delay-req
	ptpv2-l2-event
	ptpv2-l2-sync
	ptpv2-l2-delay-req
	ptpv2-event
	ptpv2-sync
	ptpv2-delay-req
---

Could the documentation be updated to reflect these friendlier labels?

Graham

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