Display postgresql.conf unit options in an easier-to-understand,

2-column format.

src/backend/utils/misc/postgresql.conf.sample

@@ -24,8 +24,11 @@
 # "postgres -c log_connections=on".  Some parameters can be changed at run time
 # with the "SET" SQL command.
 #
-# Memory units:  kB = kilobytes MB = megabytes GB = gigabytes
-# Time units:    ms = milliseconds s = seconds min = minutes h = hours d = days
+# Memory units:  kB = kilobytes          Time units:  ms = milliseconds
+#                MB = megabytes                       s = seconds
+#                GB = gigabytes                       min = minutes
+#                                                     h = hours
+#                                                     d = days
 
 
 #------------------------------------------------------------------------------