effective_go.html: Fix two links
This fixes two intra-page "type assertion" links that were broken in
different ways.
R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/9797043
diff --git a/doc/effective_go.html b/doc/effective_go.html
index 1b31686..9b0bb79 100644
--- a/doc/effective_go.html
+++ b/doc/effective_go.html
@@ -2536,7 +2536,7 @@
interface. When the JSON encoder receives a value that implements that interface,
the encoder invokes the value's marshaling method to convert it to JSON
instead of doing the standard conversion.
-The encoder checks this property at run time with a <a href="interface_conversions">type assertion</a> like:
+The encoder checks this property at run time with a <a href="#interface_conversions">type assertion</a> like:
</p>
<pre>
@@ -3254,7 +3254,7 @@
</pre>
<p>
-The second <code>if</code> statement here is another <a href="#interface_conversion">type assertion</a>.
+The second <code>if</code> statement here is another <a href="#interface_conversions">type assertion</a>.
If it fails, <code>ok</code> will be false, and <code>e</code>
will be <code>nil</code>.
If it succeeds, <code>ok</code> will be true, which means the
