_content/doc/go1.18: mention go:embed all:pattern

For golang/go#43854

Change-Id: I3724f620e0e2f122e7bbb615db8c0ce1b4151a8d
Reviewed-on: https://go-review.googlesource.com/c/website/+/393234
Reviewed-by: Bryan Mills <bcmills@google.com>
Trust: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

_content/doc/go1.18.html

diff --git a/_content/doc/go1.18.html b/_content/doc/go1.18.html
index 7646c22..9ec7fd3 100644
--- a/_content/doc/go1.18.html
+++ b/_content/doc/go1.18.html
@@ -901,6 +901,16 @@
   </dd>
 </dl><!-- debug/plan9obj -->
 
+<dl id="embed"><dt><a href="/pkg/embed/">embed</a></dt>
+  <dd>
+    <p><!-- CL 359413 -->
+      A <a href="/pkg/embed#hdr-Directives"><code>go:embed</code></a>
+      directive may now start with <code>all:</code> to include files
+      whose names start with dot or underscore.
+    </p>
+  </dd>
+</dl><!-- debug/plan9obj -->
+
 <dl id="go/ast"><dt><a href="/pkg/go/ast/">go/ast</a></dt>
   <dd>
     <p><!-- https://golang.org/issue/47781, CL 325689, CL 327149, CL 348375, CL 348609 -->