Formatting and punctuation improvements in sample configuration files

contrib/basic_archive/basic_archive.conf

@@ -1,4 +1,4 @@
-archive_mode = 'on'
+archive_mode = on
 archive_library = 'basic_archive'
 basic_archive.archive_directory = '.'
-wal_level = 'replica'
+wal_level = replica

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

@@ -449,7 +449,7 @@
 					# logging_collector to be on.
 
 # This is used when logging to stderr:
-#logging_collector = off		# Enable capturing of stderr, jsonlog
+#logging_collector = off		# Enable capturing of stderr, jsonlog,
 					# and csvlog into log files. Required
 					# to be on for csvlogs and jsonlogs.
 					# (change requires restart)