doc/go1.1.html: remove extra space; close some tags.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9941043

doc/go1.1.html

@@ -197,6 +197,7 @@ However, programs that contain implicit assumptions
 that <code>int</code> is only 32 bits may change behavior.
 For example, this code prints a positive number on 64-bit systems and
 a negative one on 32-bit systems:
+</p>
 
 <pre>
 x := ^uint32(0) // x is 0xffffffff
@@ -665,6 +666,7 @@ This function addresses a common source of confusion in the time API.
 <em>Updating</em>:
 Code that needs to read and write times using an external format with
 lower precision should be modified to use the new methods.
+</p>
 
 <h3 id="exp_old">Exp and old subtrees moved to go.exp and go.text subrepositories</h3>