doc/go1.16: fix crypto typo

Change-Id: Icf962098cc22f16b0acf75db1e82eaddb9fa0c80
Reviewed-on: https://go-review.googlesource.com/c/go/+/258777
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Author: rolandshoemaker

doc/go1.16.html

@@ -164,7 +164,7 @@ <h2 id="library">Core library</h2>
   TODO
 </p>
 
-<h3 id="ctypto/tls"><a href="/pkg/crypto/tls">crypto/tls</a></h3>
+<h3 id="crypto/tls"><a href="/pkg/crypto/tls">crypto/tls</a></h3>
 
 <p><!-- CL 256897 -->
   I/O operations on closing or closed TLS connections can now be detected using