doc/go1.17: remove runtime section

Updates #44513

Change-Id: I359d56fc3eeece3005f092cca2cb485664affc23
Reviewed-on: https://go-review.googlesource.com/c/go/+/324209
Trust: Jeremy Faller <[email protected]>
Run-TryBot: Jeremy Faller <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>

Author: jeremyfaller

doc/go1.17.html

@@ -224,12 +224,6 @@ <h3 id="vet">Vet</h3>
   TODO: complete the Vet section
 </p>
 
-<h2 id="runtime">Runtime</h2>
-
-<p>
-  TODO: complete the Runtime section
-</p>
-
 <h2 id="compiler">Compiler</h2>
 
 <p><!-- golang.org/issue/40724 -->