doc: explain pgstatindex fragmentation

It was quite hard to guess what leaf_fragmentation meant without looking
at pgstattuple's code.  This patch aims to give to the user a better
idea of what it means.

Author: Frédéric Yhuel <[email protected]>
Author: Laurenz Albe <[email protected]>
Reviewed-by: Bertrand Drouvot <[email protected]>
Reviewed-by: Benoit Lobréau <[email protected]>
Discussion: 
https://postgr.es/m/bf110561-f774-4957-a890-bb6fab6804e0%40dalibo.com
Discussion: https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/960135114629bc89da0dd1d839541098c7e6401a

Modified Files
--------------
doc/src/sgml/pgstattuple.sgml | 9 +++++++++
1 file changed, 9 insertions(+)

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