doc: add a couple of links to go1.11 release notes

Change-Id: Ie4e81b88cc8035fddf9c074363a1b35bcae3d470
Reviewed-on: https://go-review.googlesource.com/124778Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/go1.11.html

@@ -453,8 +453,9 @@ for k := range m {
 <dl id="debug/elf"><dt><a href="/pkg/debug/elf/">debug/elf</a></dt>
   <dd>
     <p><!-- CL 112115 -->
-      More <code>ELFOSABI</code> and <code>EM</code> constants have
-      been added.
+      More <a href="/pkg/debug/elf/#ELFOSABI_NONE"><code>ELFOSABI</code></a>
+      and <a href="/pkg/debug/elf/#EM_NONE"><code>EM</code></a>
+      constants have been added.
     </p>
 
 </dl><!-- debug/elf -->
@@ -482,8 +483,9 @@ for k := range m {
   <dd>
     <p><!-- CL 99696 -->
       The <code>Reader</code> now rejects attempts to set
-      the <code>Comma</code> field to a double-quote character, as
-      double-quote characters already have a special meaning in CSV.
+      the <a href="/pkg/encoding/csv/#Reader.Comma"><code>Comma</code></a>
+      field to a double-quote character, as double-quote characters
+      already have a special meaning in CSV.
     </p>
 
 </dl><!-- encoding/csv -->