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AM was used throughout the documentation to denote Access Method, but the acronym was not described. This adds an acronym entry as well as a glossary term which the acronym links to. Each page which describe AMs have the first occurrence with <acronym> markup. Reported-by: alaa.attya91@gmail.com Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://postgr.es/m/169974408805.398198.6927340566912872957@wrigleys.postgresql.org