wiki codelab: typo fix

noticed this as I was submitting the previous CL :(

R=r
CC=golang-dev
https://golang.org/cl/989045

doc/codelab/wiki/index.html

@@ -904,7 +904,7 @@ If the <code>title</code> is valid, the enclosed handler function
 </p>
 
 <p>
-Now we can wwrap the handler functions with <code>makeHandler</code> in 
+Now we can wrap the handler functions with <code>makeHandler</code> in 
 <code>main</code>, before they are registered with the <code>http</code> 
 package:
 </p>

doc/codelab/wiki/wiki.html

@@ -717,7 +717,7 @@ If the <code>title</code> is valid, the enclosed handler function
 </p>
 
 <p>
-Now we can wwrap the handler functions with <code>makeHandler</code> in 
+Now we can wrap the handler functions with <code>makeHandler</code> in 
 <code>main</code>, before they are registered with the <code>http</code> 
 package:
 </p>