pgsql: Adjust some glossary terms

Adjust some glossary terms Mostly in response to Jürgen Purtz critique of previous definitions, though I added many other changes. Author: Álvaro Herrera Reviewed-by: Jürgen Purtz Reviewed-by: Justin Pryzby Reviewed-by: Erik Rijkers Discussion: https://postgr.es/m/c1e06008-2132-30f4-9b38-877e

pgsql: Adjust some glossary terms

Adjust some glossary terms Mostly in response to Jürgen Purtz critique of previous definitions, though I added many other changes. Author: Álvaro Herrera Reviewed-by: Jürgen Purtz Reviewed-by: Justin Pryzby Reviewed-by: Erik Rijkers Discussion: https://postgr.es/m/c1e06008-2132-30f4-9b38-877e