Doc: Fix typos in the documentation and sample configuration file.

Author: pengbo0328

doc.ja/src/sgml/misc-config.sgml

@@ -87,7 +87,7 @@
       -->
       もし以下のようなメッセージが<productname>Pgpool-II</productname>ログに頻繁に出る場合は、パフォーマンス向上のため<varname>relcache_size</varname>を大きくしてください。
       <programlisting>
-       "pool_search_relcache: cache replacement happened"
+       "pool_search_relcache: cache replacement occurred"
       </programlisting>
      </para>
     </note>

doc/src/sgml/misc-config.sgml

@@ -57,7 +57,7 @@
       <productname>Pgpool-II</productname> log, you may need to
       increase the <varname>relcache_size</varname> for better performance.
       <programlisting>
-       "pool_search_relcache: cache replacement happened"
+       "pool_search_relcache: cache replacement occurred"
       </programlisting>
      </para>
     </note>

src/sample/pgpool.conf.sample-stream

@@ -930,7 +930,7 @@ backend_clustering_mode = 'streaming_replication'
 #relcache_size = 256
                                    # Number of relation cache
                                    # entry. If you see frequently:
-                                   # "pool_search_relcache: cache replacement happened"
+                                   # "pool_search_relcache: cache replacement occurred"
                                    # in the pgpool log, you might want to increase this number.
 
 #check_temp_table = catalog