doc: clarify major/minor pg_upgrade versions with examples

The previous docs added in PG 10 were not clear enough for someone who
didn't understand the PG 10 version change, so give more specific
examples.

Reported-by: [email protected]
Discussion: https://postgr.es/m/20171218213041[email protected]

Backpatch-through: 10

diff --git a/doc/src/sgml/ref/pgupgrade.sgml b/doc/src/sgml/ref/pgupgrade.sgml
index 0f8f6af98b8e367c30cd4a1ef55b35456ae29871..6dafb404a1196dbbeba1af9164e6a154b3b5c2fd 100644 (file)
--- a/doc/src/sgml/ref/pgupgrade.sgml
+++ b/doc/src/sgml/ref/pgupgrade.sgml
@@ -38,9 +38,9 @@
   pg_upgrade (formerly called pg_migrator) allows data
   stored in PostgreSQL data files to be upgraded to a later PostgreSQL
   major version without the data dump/reload typically required for
-  major version upgrades, e.g. from 9.6.3 to the current major release
-  of PostgreSQL.  It is not required for minor version upgrades, e.g. from
-  9.6.2 to 9.6.3.
+  major version upgrades, e.g. from 9.5.8 to 9.6.4 or from 10.7 to 11.2.
+  It is not required for minor version upgrades, e.g. from 9.6.2 to 9.6.3
+  or from 10.1 to 10.2.