tableam: basic documentation.

Andres Freund <andres@anarazel.de>

Commit: b73c3a11963c8bb783993cfffabb09f558f86e37
Author: Andres Freund <andres@anarazel.de>
Date: 2019-04-04T00:40:29Z
Releases: 12.0
tableam: basic documentation.

This adds documentation about the user oriented parts of table access
methods (i.e. the default_table_access_method GUC and the USING clause
for CREATE TABLE etc), adds a basic chapter about the table access
method interface, and adds a note to storage.sgml that it's contents
don't necessarily apply for non-builtin AMs.

Author: Haribabu Kommi and Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de

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