localrepo: add some basic comment for block in __getitem__
There are different early processing before getting to the core of the function.
We highlight that fact.
Differential Revision: https://phab.mercurial-scm.org/D7473
{header}
<title>Mercurial repositories index</title>
</head>
<body>
<h2><a href="/">Mercurial</a> {pathdef%breadcrumb}</h2>
<table>
<tr>
<td><a href="?sort={sort_name}">Name</a></td>
<td><a href="?sort={sort_description}">Description</a></td>
<td><a href="?sort={sort_contact}">Contact</a></td>
<td><a href="?sort={sort_lastchange}">Last modified</a></td>
<td> </td>
</tr>
{entries%indexentry}
</table>
{footer}