Fix typo.

Author: Etsuro Fujita

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

@@ -490,8 +490,8 @@
 
 #log_min_duration_statement = -1	# logs statements and their durations
 					# according to log_statement_sample_rate. -1 is disabled,
-					# 0 logs all statement, > 0 logs only statements running at
-					# least this number of milliseconds.
+					# 0 logs all statements, > 0 logs only statements running
+					# at least this number of milliseconds.
 
 #log_statement_sample_rate = 1.0	# Fraction of logged statements exceeding
 					# log_min_duration_statement to be logged.