Add common headers to CEL related configs.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@204119 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/cel.conf.sample

 ;
-; Asterisk Channel Event Logging
+; Asterisk Channel Event Logging (CEL)
 ;
+
 ; Channel Event Logging is a mechanism to provide fine-grained event information
 ; that can be used to generate billing information. Such event information can
 ; be recorded to databases and files via pluggable backend modules.

configs/cel_adaptive_odbc.conf.sample

+;
+; Asterisk Channel Event Logging (CEL) - Adaptive ODBC Backend
+;
+
 ;
 ; This configuration defines the connections and tables for which CEL records may
 ; be populated.  Each context specifies a different CEL table to be used.

configs/cel_custom.conf.sample

 ;
-; Asterisk Channel Event Logging - Custom CSV Backend
+; Asterisk Channel Event Logging (CEL) - Custom CSV Backend
 ;
+
 ; This is the configuration file for the customizable CSV backend for CEL
 ; logging.
 ;

configs/cel_pgsql.conf.sample

-; Sample Asterisk config file for CEL logging to PostgresSQL
+;
+; Asterisk Channel Event Logging (CEL) - PostgreSQL Backend
+;
+
+; Sample Asterisk config file for CEL logging to PostgreSQL
 ;
 ; CEL field names:
 ;

configs/cel_sqlite3_custom.conf.sample

+;
+; Asterisk Channel Event Logging (CEL) - SQLite 3 Backend
+;
+
 ;
 ; Mappings for sqlite3 config file
 ;