doc/go1.3.html: fix Goexit link

LGTM=minux.ma
R=r, minux.ma
CC=golang-codereviews
https://golang.org/cl/89710043
diff --git a/doc/go1.3.html b/doc/go1.3.html
index 96ea166..5b623bd 100644
--- a/doc/go1.3.html
+++ b/doc/go1.3.html
@@ -403,7 +403,7 @@
 
 <li>
 If the main goroutine calls 
-<a href="/pkg/runtime/#Goexit"><code>runtime.Goexit</code>
+<a href="/pkg/runtime/#Goexit"><code>runtime.Goexit</code></a>
 and all other goroutines finish execution, the program now always crashes,
 reporting a detected deadlock.
 Earlier versions of Go handled this situation inconsistently: most instances