Fixing invalid reference to api.php

Author: benkeen

api/v2/error_codes.html

@@ -335,8 +335,8 @@ <h3>Other</h3>
 			<td class="bold" valign="top"><a name="600"></a>600</td>
 			<td class="blue" valign="top">User</td>
 			<td>
-				The public and/or private recaptcha field key hasn't been set in your api.php file.
-				For more information, read the instructions on the
+				The public and/or private recaptcha field key haven't been set in your `/global/config.php` 
+				file. For more information, read the instructions on the
 				<a href="{{site.baseurl}}/api/v2/display_captcha">displayCaptcha()</a> page.
 			</td>
 		</tr>