Fix typo in login prompt

Author: jacobtylerwalls

trac-env/templates/plainlogin.html

@@ -14,7 +14,7 @@
 <h1>Choose how you want to log in</h1>
 
 <section class="login-github">
-  <h2>Log in with you GitHub account</h2>
+  <h2>Log in with your GitHub account</h2>
   <a href="/github/login">Log in with GitHub</a>
 <section>