Updated docs

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docs/objects/Timer/onCall.md

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+## onCall
+`onCall(self)`<br>
+A custom event which gets triggered as soon as the current timer has finished
+
+
+Here is a example on how to add a onCall event to your timer:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local aTimer = mainFrame:addTimer()
+
+function call()
+  basalt.debug("The timer has finished!")
+end
+aTimer:onCall(call)
+    :setTime(2)
+    :start()
+```
+
+Here is also a example how this is done with xml:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+
+basalt.setVariable("call", function()
+  basalt.debug("The timer has finished!")
+end)
+```
+```xml
+<timer onCall="call" time="2" start="true"/>
+```