[TAP] Fix the documentation of the property `backup_frequency`

in the TAP configuration file.

src/tap/config/tap_configuration_file.html

@@ -476,7 +476,7 @@
 				<td>
 					<p>Frequency at which the UWS service (that's to say, all its users and jobs) must be backuped.</p>
 					<p>Allowed values are: <code>never</code> (no backup will never be done), <code>user_action</code> (each time a user does a writing action, like creating or execution a job), a time (must be positive and not null) in milliseconds.</p>
-					<p><em>The value <code>user_action</code> can be used ONLY IF <code>backup_mode=true</code>.</em></p>
+					<p><em>The value <code>user_action</code> can be used ONLY IF <code>backup_by_user=true</code>.</em></p>
 					<p><em>Default: <code>backup_frequency=never</code> (no backup)</em></p>
 				</td>
 				<td><ul><li>never <em>(default)</em></li><li>user_action</li><li>3600000 <em>(1 hour)</em></li></ul></td>

src/tap/config/tap_full.properties

@@ -2,7 +2,7 @@
 #             FULL TAP CONFIGURATION FILE                #
 #                                                        #
 # TAP Version: 2.1                                       #
-# Date: 02 Aug. 2017                                     #
+# Date: 24 Jan. 2018                                     #
 # Author: Gregory Mantelet (ARI)                         #
 #                                                        #
 ########################################################## 
@@ -306,7 +306,7 @@ log_rotation =
 # Allowed values: never (no backup will never be done ; default), user_action (each time a user does a writing action, like creating or execution a job),
 #                 a time (must be positive and not null) in milliseconds.
 # 
-# The value user_action can be used ONLY IF backup_mode=true.
+# The value user_action can be used ONLY IF backup_by_user=true.
 # 
 # Default: never
 backup_frequency = never