Add help links to Mozilla KB preference documentation.

vimperator/locale/en-US/buffer.txt

@@ -233,9 +233,12 @@ zoom range (default: 30%--300%). The zoom levels are used by
 default zoom levels are 30%, 50%, 67%, 80%, 90%, 100%, 110%, 120%, 133%, 150%,
 170%, 200%, 240%, 300%.
 
-The available zoom range can be changed by setting the \'zoom.minPercent' and
-\'zoom.maxPercent' Firefox preferences. The zoom levels can be changed using
-the \'toolkit.ZoomManager.zoomLevels' preference.
+The available zoom range can be changed by setting the
+\'http://kb.mozillazine.org/Zoom.minPercent[zoom.minPercent]' and
+\'http://kb.mozillazine.org/Zoom.minPercent[zoom.maxPercent]' Firefox
+preferences. The zoom levels can be changed using the
+\'http://kb.mozillazine.org/Toolkit.zoomManager.zoomValues[toolkit.ZoomManager.zoomLevels]'
+preference.
 
 Note: \'toolkit.ZoomManager.zoomLevels' is specified as a list of values
 between 0 and 1, not as a percentage.

vimperator/locale/en-US/options.txt

@@ -189,10 +189,10 @@ they can be changed to a different value in your RC file using
 
 The following preferences are set:
 
-* browser.startup.page
-* dom.popup_allowed_events
-* accessibility.typeaheadfind.autostart
-* accessibility.typeaheadfind
+* http://kb.mozillazine.org/Browser.startup.page[browser.startup.page]
+* http://kb.mozillazine.org/Dom.popup_allowed_events[dom.popup_allowed_events]
+* http://kb.mozillazine.org/Accessibility.typeaheadfind.autostart[accessibility.typeaheadfind.autostart]
+* http://kb.mozillazine.org/Accessibility.typeaheadfind[accessibility.typeaheadfind]
 
 // TODO: others?