pgsql: docs: improve description of how to handle multiple databases

docs: improve description of how to handle multiple databases This is a redesign of the intro to the managing databases chapter. Discussion: https://postgr.es/m/[email protected] Author: David G. Johnston Backpatch-through: 9.5 Branch -- REL9_6_

pgsql: docs: improve description of how to handle multiple databases

docs: improve description of how to handle multiple databases This is a redesign of the intro to the managing databases chapter. Discussion: https://postgr.es/m/[email protected] Author: David G. Johnston Backpatch-through: 9.5 Branch -- REL_11_

pgsql: docs: improve description of how to handle multiple databases

docs: improve description of how to handle multiple databases This is a redesign of the intro to the managing databases chapter. Discussion: https://postgr.es/m/[email protected] Author: David G. Johnston Backpatch-through: 9.5 Branch -- REL9_5_

pgsql: docs: improve description of how to handle multiple databases

docs: improve description of how to handle multiple databases This is a redesign of the intro to the managing databases chapter. Discussion: https://postgr.es/m/[email protected] Author: David G. Johnston Backpatch-through: 9.5 Branch -- REL_10_

pgsql: docs: improve description of how to handle multiple databases

docs: improve description of how to handle multiple databases This is a redesign of the intro to the managing databases chapter. Discussion: https://postgr.es/m/[email protected] Author: David G. Johnston Backpatch-through: 9.5 Branch -- master

pgsql: docs: improve description of how to handle multiple databases

docs: improve description of how to handle multiple databases This is a redesign of the intro to the managing databases chapter. Discussion: https://postgr.es/m/[email protected] Author: David G. Johnston Backpatch-through: 9.5 Branch -- REL_12_

pgsql: docs: improve description of how to handle multiple databases

docs: improve description of how to handle multiple databases This is a redesign of the intro to the managing databases chapter. Discussion: https://postgr.es/m/[email protected] Author: David G. Johnston Backpatch-through: 9.5 Branch -- REL_13_