Fix documentation reference to maximum allowed for autovacuum_freeze_max_age.

The documentation mentioned setting autovacuum_freeze_max_age to
"its maximum allowed value of a little less than two billion".
This led to a post asking about the exact maximum allowed value,
which is precisely two billion, not "a little less".

Based on question by Radovan Jablonovsky.  Backpatch to 8.3.

diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index 03cc6c987a243d141b17c8a5957c37baf1085e17..adb9498578ab38dfb91ec65bd9ebbbc88eefabf9 100644 (file)
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -450,8 +450,8 @@
     will take more space, because it must store the commit status of all
     transactions back to the <varname>autovacuum_freeze_max_age</> horizon.
     The commit status uses two bits per transaction, so if
-    <varname>autovacuum_freeze_max_age</> is set to its maximum allowed value of
-    a little less than two billion, <filename>pg_clog</> can be expected to
+    <varname>autovacuum_freeze_max_age</> is set to its maximum allowed
+    value of two billion, <filename>pg_clog</> can be expected to
     grow to about half a gigabyte.  If this is trivial compared to your
     total database size, setting <varname>autovacuum_freeze_max_age</> to
     its maximum allowed value is recommended.  Otherwise, set it depending