fixed grammar in restquicktips.html

lessons/restquicktips.html

@@ -55,7 +55,7 @@
 					<p>Whether it's technically RESTful or not (according to the six constraints mentioned previously), here are a few recommended REST-like concepts. These six quick tips will result in better, more usable services.</p>
 					<h2>Use HTTP Verbs to Mean Something</h2>
 					<p>API consumers are capable of sending GET, POST, PUT, and DELETE verbs, and these verbs greatly enhance the clarity of what a given request does. Also, GET requests must not change any underlying resource data.  Measurements and tracking may still occur, which updates data, but not resource data identified by the URI.</p>
-                    <p>Generally, the four primary HTTP verb are used as follows:
+                    <p>Generally, the four primary HTTP verbs are used as follows:
                     <dl>
                         <dt>GET</dt>
                             <dd>Read a specific resource (by an identifier) or a collection of resources.</dd>