doc/go1.17: remove lingering TODO

As far as I can tell the Core Library section is complete. Remove its
TODO.

Change-Id: Ia84c6656fac045e25fae1a7ce8b488a3a26fd250
Reviewed-on: https://go-review.googlesource.com/c/go/+/326469
Trust: Heschi Kreinick <heschi@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
diff --git a/doc/go1.17.html b/doc/go1.17.html
index 988026f..49fbabd 100644
--- a/doc/go1.17.html
+++ b/doc/go1.17.html
@@ -418,10 +418,6 @@
 
 <h2 id="library">Core library</h2>
 
-<p>
-  TODO: complete the Core library section
-</p>
-
 <h3 id="runtime/cgo"><a href="/pkg/runtime/cgo">Cgo</a></h3>
 
 <p>