doc:  rewrite random_page_cost description

This removes some of the specifics of how the default was set, and adds
a mention of latency as a reason the value is lower than the storage
hardware might suggest.  It still mentions caching.

Discussion: 
https://postgr.es/m/cakanmmk_nspyr53lobuwqd59a-8u9gec3xgj43oatyjq5na...@mail.gmail.com

Backpatch-through: 13

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/3896e861b348f282813f165f60fb8ab3342114c6

Modified Files
--------------
doc/src/sgml/config.sgml | 36 ++++++++++++++++++------------------
1 file changed, 18 insertions(+), 18 deletions(-)

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