Added 'Include files' section to class references

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1698 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/timer.tex

@@ -1,6 +1,6 @@
 \section{\class{wxTimer}}\label{wxtimer}
 
-The wxTimer object is an abstraction of MS Windows and X toolkit timers. To
+The wxTimer class allows you to execute code at specified intervals. To
 use it, derive a new class and override the {\bf Notify} member to
 perform the required action. Start with {\bf Start}, stop with {\bf
 Stop}, it's as simple as that.
@@ -9,6 +9,10 @@ Stop}, it's as simple as that.
 
 \helpref{wxObject}{wxobject}
 
+\wxheading{Include files}
+
+<wx/timer.h>
+
 \wxheading{See also}
 
 \helpref{::wxStartTimer}{wxstarttimer}, \helpref{::wxGetElapsedTime}{wxgetelapsedtime}