epggrab: Update doc

docs/html/config_epggrab.html

@@ -48,6 +48,51 @@ <h2>Grabber Modules</h2>
   <a href='http://github.com/adamsutton/PyEPG'>http://github.com/adamsutton/PyEPG</a>.</li>
  </ul>
 
+ <h2>Cron multi-line config text areas</h2>
+ <ul>
+
+ <li><p>The cron lines looks like:</p>
+ <pre>
+   # * * * * *  command to execute
+   # ┬ ┬ ┬ ┬ ┬
+   # │ │ │ │ │
+   # │ │ │ │ │
+   # │ │ │ │ └───── day of week (0 - 6) (0 to 6 are Sunday to Saturday, or use names; 7 is Sunday, the same as 0)
+   # │ │ │ └────────── month (1 - 12)
+   # │ │ └─────────────── day of month (1 - 31)
+   # │ └──────────────────── hour (0 - 23)
+   # └───────────────────────── min (0 - 59)</pre>
+
+ <li><b>Cron special characters</b>
+ <dl>
+ <dt>Asterisk ( * )
+ <dd>The asterisk indicates that the cron expression matches for all values
+     of the field. E.g., using an asterisk in the 4th field (month)
+     indicates every month.
+
+ <dt>Slash ( / )
+ <dd>Slashes describe increments of ranges. For example 3-59/15 in the
+     1st field (minutes) indicate the third minute of the hour and every
+     15 minutes thereafter. The form "*/..." is equivalent to the form
+     "first-last/...", that is, an increment over the largest possible
+     range of the field.
+
+ <dt>Comma ( , )
+ <dd>Commas are used to separate items of a list. For example, using
+     "MON,WED,FRI" in the 5th field (day of week) means Mondays,
+     Wednesdays and Fridays.
+
+ <dt>Hyphen ( - )
+ <dd>Hyphens define ranges. For example, 2000-2010 indicates every year
+     between 2000 and 2010 AD, inclusive.
+
+ <dt>Number-sign ( # )
+ <dd>Number-sign defines a start of a comment. The rest of line is
+     ignored behind this character.
+ </dl>
+
+ </ul>
+
  <h2>Configuration options</h2>
 
  <h3>General Config</h3>
@@ -74,14 +119,26 @@ <h3>Internal Grabber</h3>
   <dt>Module:
   <dd>Select which internal grabber to use.
 
-  <dt>Grab interval
-  <dd>Time period between grabs. Value and unit are independently set.
+  <dt>Cron multi-line
+  <dd>Multiple lines of the cron time specification.
  </dl>
 
  <h3>Over-the-air Grabbers</h3>
- <p>
- Checkbox list to enable/disable available modules. 
- By default all grabbers should be enabled.
+ <dl>
+  <dt>Force initial EPG scan at startup
+  <dd>... no comment
+
+  <dt>Cron multi-line
+  <dd>Multiple lines of the cron time specification.
+
+  <dt>EPG scan timeout in seconds
+  <dd>The multiplex (mux) is tuned for this amount of time at maximum. If EPG data
+      are completed before this limit, the mux is released sooner.
+
+  <dt>Checkbox list
+  <dd>Checkbox list to enable/disable available modules.
+      By default all grabbers should be enabled.
+ </dl>
 
  <h3>External interfaces</h3>
  <p>