Reorder vacuum GUCs in postgresql.conf.sample to match docs

ca9c6a5 consolidated most of vacuum-related GUCs' documentation into
a new subsection. It neglected, however, to reorganize
postgresql.conf.sample to match the new order. Do this now.

Reported-by: Álvaro Herrera
Discussion: https://postgr.es/m/202501110902.5banlseavz7c%40alvherre.pgsql

Author: melanieplageman

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

@@ -185,14 +185,6 @@
 #max_files_per_process = 1000		# min 64
 					# (change requires restart)
 
-# - Cost-Based Vacuum Delay -
-
-#vacuum_cost_delay = 0			# 0-100 milliseconds (0 disables)
-#vacuum_cost_page_hit = 1		# 0-10000 credits
-#vacuum_cost_page_miss = 2		# 0-10000 credits
-#vacuum_cost_page_dirty = 20		# 0-10000 credits
-#vacuum_cost_limit = 200		# 1-10000 credits
-
 # - Background Writer -
 
 #bgwriter_delay = 200ms			# 10-10000ms between rounds
@@ -656,9 +648,11 @@
 
 
 #------------------------------------------------------------------------------
-# AUTOVACUUM
+# VACUUMING
 #------------------------------------------------------------------------------
 
+# - Automatic Vacuuming -
+
 #autovacuum = on			# Enable autovacuum subprocess?  'on'
 					# requires track_counts to also be on.
 autovacuum_worker_slots = 16	# autovacuum worker slots to allocate
@@ -688,6 +682,22 @@ autovacuum_worker_slots = 16	# autovacuum worker slots to allocate
 					# autovacuum, -1 means use
 					# vacuum_cost_limit
 
+# - Cost-Based Vacuum Delay -
+
+#vacuum_cost_delay = 0			# 0-100 milliseconds (0 disables)
+#vacuum_cost_page_hit = 1		# 0-10000 credits
+#vacuum_cost_page_miss = 2		# 0-10000 credits
+#vacuum_cost_page_dirty = 20		# 0-10000 credits
+#vacuum_cost_limit = 200		# 1-10000 credits
+
+# - Freezing -
+
+#vacuum_freeze_table_age = 150000000
+#vacuum_freeze_min_age = 50000000
+#vacuum_failsafe_age = 1600000000
+#vacuum_multixact_freeze_table_age = 150000000
+#vacuum_multixact_freeze_min_age = 5000000
+#vacuum_multixact_failsafe_age = 1600000000
 
 #------------------------------------------------------------------------------
 # CLIENT CONNECTION DEFAULTS
@@ -722,12 +732,6 @@ autovacuum_worker_slots = 16	# autovacuum worker slots to allocate
 #lock_timeout = 0				# in milliseconds, 0 is disabled
 #idle_in_transaction_session_timeout = 0	# in milliseconds, 0 is disabled
 #idle_session_timeout = 0			# in milliseconds, 0 is disabled
-#vacuum_freeze_table_age = 150000000
-#vacuum_freeze_min_age = 50000000
-#vacuum_failsafe_age = 1600000000
-#vacuum_multixact_freeze_table_age = 150000000
-#vacuum_multixact_freeze_min_age = 5000000
-#vacuum_multixact_failsafe_age = 1600000000
 #bytea_output = 'hex'			# hex, escape
 #xmlbinary = 'base64'
 #xmloption = 'content'