katzgrau  committed 1b17395

Adding a link to the User Agent Class docs from the user_agent function of the input class

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File user_guide/libraries/input.html

 <p>Returns the user agent (web browser) being used by the current user. Returns FALSE if it's not available.</p>
 <code>echo $this->input->user_agent();</code>
+<p>See the <a href="user_agent.html">User Agent Class</a> for methods which extract information from the user agent string.</p>
 <p>Useful if running in a non-Apache environment where <a href="">apache_request_headers()</a> will not be supported.  Returns an array of headers.</p>