docs: replace "stable storage" with "durable" in descriptions

For PG, "durable storage" has a clear meaning, while "stable storage"
does not, so use the former.

Discussion: https://postgr.es/m/20200817165222.GA31806@momjian.us

Backpatch-through: 9.5

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 74bb25ae16e929125ae7b74b68ff181cb40ad95c..ad4f13277fc0378ca1a29c71be1903b2addadce4 100644 (file)
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2122,7 +2122,7 @@ include_dir 'conf.d'
         until a reply from the current synchronous standby indicates it has
         received the commit record of the transaction and written it out to
         the standby's operating system, but the data has not necessarily
-        reached stable storage on the standby. This setting is sufficient to
+        reached durable storage on the standby. This setting is sufficient to
         ensure data preservation even if the standby instance of
         <productname>PostgreSQL</> were to crash, but not if the standby
         suffers an operating-system-level crash.