add {profile-name} description

extension/ui/pages/help.html

@@ -639,6 +639,7 @@
 						e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)</li>
 					<li><code>{digest-sha-384}</code>: the SHA-384 hash value of the entire page content</li>
 					<li><code>{digest-sha-512}</code>: the SHA-512 hash value of the entire page content</li>
+					<li><code>{profile-name}</code>: the name of the profile used to save the page</li>
 				</ul>
 			</li>
 			<li><a id="notes">Technical notes</a>