Fix typos in documentation.  Patch by tirkarthi. (GH-13354)

diff --git a/Lib/idlelib/help.html b/Lib/idlelib/help.html
index ba44331..56f9ca5 100644
--- a/Lib/idlelib/help.html
+++ b/Lib/idlelib/help.html
@@ -6,7 +6,7 @@
   <head>
     <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <title>IDLE &#8212; Python 3.8.0a3 documentation</title>
+    <title>IDLE &#8212; Python 3.8.0a4 documentation</title>
     <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
 
@@ -19,7 +19,7 @@
     <script type="text/javascript" src="../_static/sidebar.js"></script>
 
     <link rel="search" type="application/opensearchdescription+xml"
-          title="Search within Python 3.8.0a3 documentation"
+          title="Search within Python 3.8.0a4 documentation"
           href="../_static/opensearch.xml"/>
     <link rel="author" title="About these documents" href="../about.html" />
     <link rel="index" title="Index" href="../genindex.html" />
@@ -72,7 +72,7 @@
 
 
     <li>
-      <a href="../index.html">3.8.0a3 Documentation</a> &#187;
+      <a href="../index.html">3.8.0a4 Documentation</a> &#187;
     </li>
 
           <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
@@ -130,7 +130,7 @@
 default title and context menu.</p>
 <p>On macOS, there is one application menu.  It dynamically changes according
 to the window currently selected.  It has an IDLE menu, and some entries
-described below are moved around to conform to Apple guidlines.</p>
+described below are moved around to conform to Apple guidelines.</p>
 <div class="section" id="file-menu-shell-and-editor">
 <h3>File menu (Shell and Editor)<a class="headerlink" href="#file-menu-shell-and-editor" title="Permalink to this headline">¶</a></h3>
 <dl class="docutils">
@@ -910,7 +910,7 @@
 
 
     <li>
-      <a href="../index.html">3.8.0a3 Documentation</a> &#187;
+      <a href="../index.html">3.8.0a4 Documentation</a> &#187;
     </li>
 
           <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
@@ -941,7 +941,7 @@
 <br />
     <br />
 
-    Last updated on Apr 26, 2019.
+    Last updated on May 16, 2019.
     <a href="https://docs.python.org/3/bugs.html">Found a bug</a>?
     <br />