doc/effective_go.html: fix unescaped less-than character

Why doesn't tidy complain about these?
Found by manlio.perillo.
Fixes #6571

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/14608044

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/effective_go.html b/doc/effective_go.html
index 9d002c5043..30c015aea1 100644
--- a/doc/effective_go.html
+++ b/doc/effective_go.html
@@ -2953,7 +2953,7 @@ func handle(r *Request) {
 }
 
 func init() {
-    for i := 0; i < MaxOutstanding; i++ {
+    for i := 0; i &lt; MaxOutstanding; i++ {
         sem &lt;- 1
     }
 }