doc/go1.22: remove empty cgo section

The only issue in this section, golang#56378, does not need a release note
for Go 1.22 because its feature was disabled for this release.

For golang#61422.
Updates golang#56378.

Change-Id: Ia4e090994cd9ac04e855f8b3a2c6ca0cde4485d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/548876
Auto-Submit: Bryan Mills <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: Bryan C. Mills

doc/go1.22.html

@@ -117,13 +117,6 @@ <h3 id="go-command">Go command</h3>
   <code>mymod/mypack    coverage: 0.0% of statements</code>
 </p>
 
-<h3 id="cgo">Cgo</h3>
-
-<!-- https://go.dev/issue/56378 -->
-<p>
-  <!-- add #cgo noescape/nocallback annotations -->
-</p>
-
 <h3 id="trace">Trace</h3>
 
 <!-- https://go.dev/issue/63960 -->