doc/go1.18: mention new debug/elf.R_PPC64_RELATIVE constant

For #47694

Change-Id: I9f4838100741d3ba13e9374e70466fa405c6e4d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/372634
Trust: Ian Lance Taylor <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Emmanuel Odeke <[email protected]>

Author: ianlancetaylor

doc/go1.18.html

@@ -483,7 +483,7 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
       The new <a href="/pkg/bufio#Writer.AvailableBuffer"><code>Writer.AvailableBuffer</code></a>
       method returns an empty buffer with a possibly non-empty capacity for use
       with append-like APIs. After appending, the buffer can be provided to a
-			succeeding <code>Write</code> call and possibly avoid any copying.
+      succeeding <code>Write</code> call and possibly avoid any copying.
     </p>
 
     <p><!-- CL 345570 -->
@@ -531,6 +531,15 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
   </dd>
 </dl><!-- crypto/tls -->
 
+<dl id="debug/elf"><dt><a href="/pkg/debug/elf/">debug/elf</a></dt>
+  <dd>
+    <p><!-- CL 352829 -->
+      The <a href="/pkg/debug/elf/#R_PPC64_RELATIVE"><code>R_PPC64_RELATIVE</code></a>
+      constant has been added.
+    </p>
+  </dd>
+</dl><!-- debug/elf -->
+
 <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 -->