net: docs: add missing features that can have stats

While trying to figure out ethtool -I | --include-statistics, I noticed
some docs got missed when implementing commit 0e9c127729be ("ethtool:
add interface to read Tx hardware timestamping statistics").

Fix up the docs to match the kernel code, and while there, sort them in
alphabetical order.

Reviewed-by: Jacob Keller <[e-mail]>
Reviewed-by: Rahul Rameshbabu <[e-mail]>
Reviewed-by: Jakub Kicinski <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Jesse Brandeburg <[e-mail]>
Reviewed-by: Paul Menzel <[e-mail]>
Reviewed-by: Aleksandr Loktionov <[e-mail]>
Signed-off-by: Jacob Keller <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/networking/statistics.rst

···
 the `ETHTOOL_FLAG_STATS` flag in `ETHTOOL_A_HEADER_FLAGS`. Currently
 statistics are supported in the following commands:
 
-  - `ETHTOOL_MSG_PAUSE_GET`
   - `ETHTOOL_MSG_FEC_GET`
+  - `ETHTOOL_MSG_LINKSTATE_GET`
   - `ETHTOOL_MSG_MM_GET`
+  - `ETHTOOL_MSG_PAUSE_GET`
+  - `ETHTOOL_MSG_TSINFO_GET`
 
 debugfs
 -------