code review 5707065: doc: add a bunch of missing <p> tags

doc/code.html

 <!--{
         "Title": "How to Write Go Code"
 }-->
 
 <h2 id="Introduction">Introduction</h2>
 
 <p>
 This document explains how to write a new package
 and how to test code.
 It assumes you have installed Go using the
@@ skipping 305 matching lines @@
 <p>For example, consider the package <code>foo</code> that consists of four
 files:</p>
 
 <pre>
 foo.go
 foo_386.go
 foo_amd64.go
 foo_arm.go
 </pre>
 
-describes a package that builds on
+<p>describes a package that builds on
 different architectures by parameterizing the file name with
 <code>$GOARCH</code>.</p>
 
 <p>The general code goes in <code>foo.go</code>, while architecture-specific
 code goes in <code>foo_386.go</code>, <code>foo_amd64.go</code>, and
 <code>foo_arm.go</code>.</p>
 
 <p>If you follow these conventional parameterizations, tools such as the <a
 href="/cmd/go/"><code>go</code> tool</a> will work seamlessly with your
 package:</p>
 
 <pre>
 foo_$GOOS.go
 foo_$GOARCH.go
 foo_$GOOS_$GOARCH.go
 </pre>
 
 <p>The same holds for <code>.s</code> (assembly) and <code>.c</code> files.</p>