Add i/o test into examples.htm

Author: linev

docs/examples.htm

@@ -410,6 +410,7 @@ <h1 id="version"><a href=".." style="color:green">JSROOT</a></h1>
               { name:"split", file: "gr2.root", item: "c1equi;1", title: "split line in legend, ignored " }
             ],
             Misc : [
+              { name:"io", url: "?file=" + filepath + "iotest.root&layout=grid4x3&items=[ex1,ex2,ex3,ex4,ex5,ex6,ex7,ex8,ex9,ex10,clones,map]&opts=[inspect,inspect,inspect,inspect,inspect,inspect,inspect,inspect,inspect,inspect,inspect,inspect]", title: "Different I/O test classes" },
               { name:"io56", file: "fitLinear56.root", item: "fitLinear6", title: "file with two version from ROOT 5/6 of same object" },
               { name:"folder", url: "?file=" + filepath + "folders.root&expand=RsnMgr;1/input/0/2/10", title: "TFolder class" },
               { name:"task", url: "?file=" + filepath + "tasks.root&expand=run;1", title: "TTask class" },