[release-branch.go1.12] doc/go1.12: soften, expand crypto/rc4 assembly removal text

Change-Id: I46fa43f6c5ac49386f4622e1363d8976f49c0894
Reviewed-on: https://go-review.googlesource.com/c/162019
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit c75ee696c341cef94b00409b3692f3df82af1c71)
Reviewed-on: https://go-review.googlesource.com/c/162357

diff --git a/doc/go1.12.html b/doc/go1.12.html
index a007923ebb3de9f795a6e73ede2868b5904a2ee3..fda61a69a760b70921a8a27049e429d8fcd91838 100644 (file)
--- a/doc/go1.12.html
+++ b/doc/go1.12.html
@@ -495,8 +495,11 @@ for {
 <dl id="crypto/rc4"><dt><a href="/pkg/crypto/rc4/">crypto/rc4</a></dt>
   <dd>
     <p><!-- CL 130397 -->
-      This release removes the optimized assembly implementations. RC4 is insecure
-      and should only be used for compatibility with legacy systems.
+      This release removes the assembly implementations, leaving only
+      the pure Go version. The Go compiler generates code that is
+      either slightly better or slightly worse, depending on the exact
+      CPU. RC4 is insecure and should only be used for compatibility
+      with legacy systems.
     </p>
 
 </dl><!-- crypto/rc4 -->