Fixed comments in sample pgpool.conf.

- The comment for sr_check_period. The default value should be 10 seconds.
- Also fixed some typos in comments.

Patch is created by hiroin and modified by Bo Peng.

src/sample/pgpool.conf.sample-stream

@@ -54,7 +54,7 @@ backend_clustering_mode = 'streaming_replication'
 #reserved_connections = 0
                                    # Number of reserved connections.
                                    # Pgpool-II does not accept connections if over
-                                   # num_init_chidlren - reserved_connections.
+                                   # num_init_children - reserved_connections.
 
 
 # - pgpool Communication Manager Connection Settings -
@@ -426,17 +426,17 @@ backend_clustering_mode = 'streaming_replication'
                                    # Semicolon separated list of query patterns
                                    # that should be sent to primary node
                                    # Regexp are accepted
-                                   # valid for streaming replicaton mode only.
+                                   # valid for streaming replication mode only.
 
 #database_redirect_preference_list = ''
                                    # comma separated list of pairs of database and node id.
                                    # example: postgres:primary,mydb[0-4]:1,mydb[5-9]:2'
-                                   # valid for streaming replicaton mode only.
+                                   # valid for streaming replication mode only.
 
 #app_name_redirect_preference_list = ''
                                    # comma separated list of pairs of app name and node id.
                                    # example: 'psql:primary,myapp[0-4]:1,myapp[5-9]:standby'
-                                   # valid for streaming replicaton mode only.
+                                   # valid for streaming replication mode only.
 #allow_sql_comments = off
                                    # if on, ignore SQL comments when judging if load balance or
                                    # query cache is possible.
@@ -493,10 +493,10 @@ backend_clustering_mode = 'streaming_replication'
 
 #sr_check_period = 10
                                    # Streaming replication check period
-                                   # Disabled (0) by default
+                                   # Default is 10s.
 #sr_check_user = 'nobody'
                                    # Streaming replication check user
-                                   # This is neccessary even if you disable streaming
+                                   # This is necessary even if you disable streaming
                                    # replication delay check by sr_check_period = 0
 #sr_check_password = ''
                                    # Password for streaming replication check user
@@ -567,7 +567,7 @@ backend_clustering_mode = 'streaming_replication'
                                    # Default is 10000 ms (10 second). Flaky network user may want to increase
                                    # the value. 0 means no timeout.
                                    # Note that this value is not only used for health check,
-                                   # but also for ordinary conection to backend.
+                                   # but also for ordinary connection to backend.
 
 #------------------------------------------------------------------------------
 # HEALTH CHECK PER NODE PARAMETERS (OPTIONAL)
@@ -632,7 +632,7 @@ backend_clustering_mode = 'streaming_replication'
 
 #detach_false_primary = off
                                    # Detach false primary if on. Only
-                                   # valid in streaming replicaton
+                                   # valid in streaming replication
                                    # mode and with PostgreSQL 9.6 or
                                    # after.
 
@@ -669,7 +669,7 @@ backend_clustering_mode = 'streaming_replication'
                                    # -1 means immediate disconnection
 
 #auto_failback = off
-                                   # Dettached backend node reattach automatically
+                                   # Detached backend node reattach automatically
                                    # if replication_state is 'streaming'.
 #auto_failback_interval = 1min
                                    # Min interval of executing auto_failback in
@@ -694,7 +694,7 @@ backend_clustering_mode = 'streaming_replication'
                                     # (change requires restart)
 
 #trusted_server_command = 'ping -q -c3 %h'
-                                    # Command to excute when communicate trusted server.
+                                    # Command to execute when communicate trusted server.
                                     # Special values:
                                     #   %h = host name specified by trusted_servers
 
@@ -921,7 +921,7 @@ backend_clustering_mode = 'streaming_replication'
 #relcache_size = 256
                                    # Number of relation cache
                                    # entry. If you see frequently:
-                                   # "pool_search_relcache: cache replacement happend"
+                                   # "pool_search_relcache: cache replacement happened"
                                    # in the pgpool log, you might want to increate this number.
 
 #check_temp_table = catalog