Fix some whitespace formatting, and remove an overly-verbose

parameter description: postgresql.conf is not the place for
documentating the functionality of a GUC var.

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

@@ -168,10 +168,7 @@
 				 #   debug5, debug4, debug3, debug2, debug1,
 				 #   info, notice, warning, error, panic(off)
 				 
-#log_min_duration_statement = -1 # Log all statements whose
-				 # execution time exceeds the value, in
-				 # milliseconds.  Zero prints all queries.
-				 # Minus-one disables.
+#log_min_duration_statement = -1 # -1 is disabled, in milliseconds.
 
 #silent_mode = false		 # DO NOT USE without Syslog!