Mention how to disable ticks

git-svn-id: https://flot.googlecode.com/svn/trunk@24 1e0a6537-2640-0410-bfb7-f154510ff394

API.txt

@@ -174,6 +174,10 @@ Or like this (you can mix the two if you like):
 
   ticks: [[0, "zero"], [1.2, "one mark"], [2.4, "two marks"]]
 
+You can disable the ticks by providing an empty array:
+
+  ticks: []
+  
 For extra flexibility you can specify a function as the "ticks"
 parameter. The function will be called with an object with the axis
 min and max and should return a ticks array. Here's a simplistic tick