Doc: fix a couple of erroneous examples.
The example given for anyelement <@ anymultirange didn't return
true as claimed; adjust it so it does.
In passing, change a couple of sample results where the modern
numeric-based logic produces a different number of trailing zeroes
than before.
Erik Rijkers
Discussion: https://postgr.es/m/
cc35735d-1ec1-5bb3-9e27-
cddbab7afa23@xs4all.nl