Issue #791 - Rephrasing cargo login comments to remove reference to a specific file.

Author: autodidaddict

app/templates/me/index.hbs

@@ -30,9 +30,13 @@
     </div>
 
     <p>
-        If you want to use package commands from the command line, you'll need a
-        <code>~/.cargo/credentials</code>, the first step to creating this
-        is to generate a new token using the button above.
+        If you want to use package commands from the command line, you will need to
+        login with <code>cargo login (token)</code> using one of the tokens listed below.
+    </p>
+    <p>
+        When working in shared environments, supplying the token on the command line could
+        expose it to prying eyes. To avoid this, enter <code>cargo login</code> and supply your
+        token when prompted.
     </p>
 
     <div id='tokens'>