[DOCS] Stats views and functions not in order?

Hi Hackers.

I noticed that there are quite a few items in Chapter 28.2 "The
Cumulative Statistics System" [1] which have no obvious order.

e.g.

- The views (28.2.3 -> 28.2.23) don't seem to be in any order that I
could work out. Why not alphabetical?

- [2] Table 2.1 "Dynamic Statistics View" views are not in alphabetical order?

- [2] Table 2.2 "Collected Statistics View" views are not in alphabetical order?

- [3] Table 28.34 "Additional Statistics Functions" the
'pg_stat_clear_snapshot' is the only one not in order?

- [3] Table 28.35 "Per-Backend Statistics Functions" the
'pg_stat_get_backend_idset' is the only one not in order?

~~

So it doesn't seem as readable as it could be. If other people think
the same, I can write a patch for it.

Thoughts?

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[1] https://www.postgresql.org/docs/devel/monitoring-stats.html
[2] https://www.postgresql.org/docs/devel/monitoring-stats.html#MONITORING-STATS-VIEWS
[3] https://www.postgresql.org/docs/devel/monitoring-stats.html#MONITORING-STATS-FUNCTIONS

Kind Regards,
Peter Smith.
Fujitsu Australia.