Improve terminology for scroll restoration mode

- Make it clear that ```history.scrollRestoration``` reflects the
  "current entry of the session history"
- Make sure the default value is defined for the concept not the
  attribute
- Fix minor link issues in example description

source

@@ -80417,7 +80417,7 @@ interface <dfn>History</dfn> {
 
    <dd>
 
-    <p>The <span>scroll restoration mode</span> of the current entry in the <span>joint session history</span>.</p>
+    <p>The <span>scroll restoration mode</span> of the current entry in the <span>session history</span>.</p>
 
    </dd>
 
@@ -80526,8 +80526,8 @@ interface <dfn>History</dfn> {
 
   <p>The <dfn><code data-x="dom-history-scroll-restoration">scrollRestoration</code></dfn> attribute
   of the History interface, on getting, must return the <span>scroll restoration mode</span> of the
-  <span>current entry of the joint session history</span>. On setting, the <span>scroll restoration
-  mode</span> of the <span>current entry of the joint session history</span> must be set to the new
+  current entry in the <span>session history</span>. On setting, the <span>scroll restoration mode
+  </span> of the current entry in the <span>session history</span> must be set to the new
   value. <span>Scroll restoration mode</span> may be one of the following:</p>
   <dl>
    <dt>"<dfn><code subdfn data-x="dom-ScrollRestoration-auto">auto</code></dfn>"</dt>
@@ -80537,7 +80537,8 @@ interface <dfn>History</dfn> {
    to do so automatically</dd>
   </dl>
 
-  <p>Initially, its value must be "<code data-x="dom-ScrollRestoration-auto">auto</code>".</p>
+  <p>If unspecified, the <span>scroll restoration mode</span> of a new entry must be set to
+  "<code data-x="dom-ScrollRestoration-auto">auto</code>".</p>
 
   <p>The <dfn><code data-x="dom-history-state">state</code></dfn> attribute of the
   <code>History</code> interface must return the last value it was set to by the user agent.
@@ -80745,8 +80746,8 @@ interface <dfn>History</dfn> {
      <li><p>Add a <span>state object</span> entry to the session history, after the <span>current
      entry</span>, with <var>cloned data</var> as the <span>state object</span>, the given
      <var>title</var> as the title, <var>new URL</var> as the <span>URL</span>
-     of the entry, and the <span>scroll restoration mode</span> of the <span>current entry of the
-     joint session history</span> as the scroll restoration mode.</p></li>
+     of the entry, and the <span>scroll restoration mode</span> of the current entry in the
+     <span>session history</span> as the scroll restoration mode.</p></li>
 
      <li><p>Update the <span>current entry</span> to be this newly added entry.</p></li>
 
@@ -80896,10 +80897,10 @@ State: &lt;OUTPUT NAME=I>1&lt;/OUTPUT> &lt;INPUT VALUE="Increment" TYPE=BUTTON O
   </div>
 
   <div class="example">
-   <p>Most applications want to use the same scroll restoration mode value for all of their history
-   entries. To achieve this they should set the <code data-x="dom-history-scroll-restoration">scrollRestoration</code>
-   attribute as soon as possible (e.g., in first script tag in the document's
-   <code>&lt;head&gt;</code>) to ensure that any entry added to the history session gets the desired
+   <p>Most applications want to use the same <span>scroll restoration mode</span> value for all of
+   their history entries. To achieve this they should set the <code data-x="dom-history-scroll-restoration">scrollRestoration</code>
+   attribute as soon as possible (e.g., in the first <code>script</code> element in the document's
+   <code>head</code> element) to ensure that any entry added to the history session gets the desired
    scroll restoration mode.</p>
 
    <pre>&lt;head&gt;