Revert "Add doc link to custom rules syntax help."

This reverts commit 7874735810.

common/dialogs/html_message_box.cpp

@@ -25,10 +25,8 @@
 #include <wx/clipbrd.h>
 #include <wx/log.h>
 #include <wx/textctrl.h>
-#include <wx/uri.h>
 #include <string_utils.h>
 #include <dialogs/html_message_box.h>
-#include <build_version.h>
 
 
 HTML_MESSAGE_BOX::HTML_MESSAGE_BOX( wxWindow* aParent, const wxString& aTitle,
@@ -146,20 +144,6 @@ void HTML_MESSAGE_BOX::ShowModeless()
 }
 
 
-void HTML_MESSAGE_BOX::OnHTMLLinkClicked( wxHtmlLinkEvent& event )
-{
-    wxString href = event.GetLinkInfo().GetHref();
-
-    if( href.StartsWith( wxS( "https://docs.kicad.org/" ) ) )
-    {
-        href.Replace( wxS( "GetMajorMinorVersion" ), GetMajorMinorVersion() );
-
-        wxURI uri( href );
-        wxLaunchDefaultBrowser( uri.BuildURI() );
-    }
-}
-
-
 void HTML_MESSAGE_BOX::OnCharHook( wxKeyEvent& aEvent )
 {
     // shift-return (Mac default) or Ctrl-Return (GTK) for OK