asciidoc: consistently use 1 space after full stop
Note: the command doc strings included in hg (1) are still
inconsistent wrt to spaces after full stops.
#header#
<title>Mercurial Error</title>
</head>
<body>
<h2>Mercurial Error</h2>
<p>
An error occurred while processing your request:
</p>
<p>
#error|escape#
</p>
#footer#