Refactor documentation about privileges to centralize the info.

Expand section 5.6 "Privileges" to include the full definition of
each privilege type, and an explanation of aclitem privilege displays,
along with some helpful summary tables.  Most of this material came
out of the GRANT reference page, although some of it is new.
Adjust a bunch of links that were pointing to GRANT to point to 5.6.

Fabien Coelho and Tom Lane, reviewed by Bradley DeJong

Discussion: https://postgr.es/m/alpine.DEB.2.21.1807311735200.20743@lancre

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