patterndb: fixed the example message formatting (#161)

Author: HofiOne

doc/_admin-guide/120_Parser/023_db_parser/001_Using_pattern_databases/002_Correlating_log_messages.md

@@ -69,7 +69,7 @@ Note the following points about timeout values:
 
     Consider the following two messages:
 
-    ><38>1990-01-01T14:45:25 customhostname program6[1234]: program6 testmessage
+    ><38>1990-01-01T14:45:25 customhostname program6[1234]: program6 testmessage\
     ><38>1990-01-01T14:46:25 customhostname program6[1234]: program6 testmessage
 
     If the context-timeout is 10 seconds and {{ site.product.short_name }} receives the