Fix docs examples (#426)

* openweathermap didn't work (needs an API key), so we use another free API
* websockets didn't work when using https, it has to be wss (secure socket)
* 2 cosmetic changes

Author: sjrd

example/src/main/scala/example/Example.scala

@@ -123,9 +123,8 @@ object XMLHttpRequest{
   @JSExport
   def main(pre: html.Pre) = {
     val xhr = new dom.XMLHttpRequest()
-    xhr.open("GET",
-      "http://api.openweathermap.org/" +
-      "data/2.5/weather?q=Singapore"
+    xhr.open("GET", 
+      "https://www.boredapi.com/api/activity"
     )
     xhr.onload = { (e: dom.Event) =>
       if (xhr.status == 200) {
@@ -142,7 +141,7 @@ object Websocket {
   @JSExport
   def main(in: html.Input,
            pre: html.Pre) = {
-    val echo = "ws://echo.websocket.org"
+    val echo = "wss://echo.websocket.org"
     val socket = new dom.WebSocket(echo)
     socket.onmessage = {
       (e: dom.MessageEvent) =>
@@ -167,8 +166,7 @@ object AjaxExtension {
                 .Implicits
                 .global
     val url =
-      "http://api.openweathermap.org/" +
-      "data/2.5/weather?q=Singapore"
+      "https://www.boredapi.com/api/activity"
     Ajax.get(url).foreach { case xhr =>
       pre.textContent = xhr.responseText
     }

readme/Index.scalatex

@@ -48,7 +48,7 @@
   @pair("Alert", Nil)
 
   @p
-    Will cause a javascript alert box saying `HAI` to appear. Other javascript classes and objects can be similarly accessed e.g. @hl.scala{new dom.XMLHttpRequest()} to perform a new Ajax request, @hl.scala{dom.document} to access the global @hl.scala{document} object, or @hl.scala{html.Div} to to refer to the type of a @hl.scala{<div>} element.
+    Will cause a javascript alert box saying `Hi from Scala-js-dom` to appear. Other javascript classes and objects can be similarly accessed e.g. @hl.scala{new dom.XMLHttpRequest()} to perform a new Ajax request, @hl.scala{dom.document} to access the global @hl.scala{document} object, or @hl.scala{html.Div} to to refer to the type of a @hl.scala{<div>} element.
 
   @sect{Usage}
     @p
@@ -90,7 +90,7 @@
     @sect{Node.onmousemove}
       @pair(
        "EventHandler",
-        Seq(pre("pre")),
+        Seq(pre("Hover this box!")),
         autorun=true
       )