doc: remove last TODO item

For golang#61422

Change-Id: I50e427b78a533c3196aeb5291a34c05528ee0bed
Reviewed-on: https://go-review.googlesource.com/c/go/+/557455
Reviewed-by: Cherry Mui <[email protected]>
Auto-Submit: Carlos Amedee <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: cagedmantis

doc/go1.22.html

@@ -419,10 +419,6 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
   There are also various performance improvements, not enumerated here.
 </p>
 
-<!-- <p> -->
-<!--   TODO: complete this section -->
-<!-- </p> -->
-
 <dl id="archive/tar"><dt><a href="/pkg/archive/tar/">archive/tar</a></dt>
   <dd>
     <p><!-- https://go.dev/issue/58000, CL 513316 -->