Remove unnecessary space from watchexec.1.html

doc/watchexec.1.html

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 <dt class="flush"><var>command</var></dt><dd><p>Command to run when watched files are modified, and at startup, unless <code>--postpone</code> is specified. All <var>argument</var>s are passed to <var>command</var>.</p></dd>
 <dt><code>-e</code>, <code>--exts</code> <var>extensions</var></dt><dd><p>Comma-separated list of file extensions to filter by. Leading dots are allowed (.rs) are allowed. (This is a shorthand for <code>-f</code>).</p></dd>
 <dt><code>-f</code>, <code>--filter</code> <var>pattern</var></dt><dd><p>Ignores modifications from paths that do not match <var>pattern</var>. This option can be specified multiple times, where a match on any given pattern causes the path to trigger <var>command</var>.</p></dd>
-<dt><code>-s</code>, <code>--signal</code> <var>SIGNAL</var></dt><dd><p> Sends the specified signal (e.g. <code>SIGKILl</code>) to the child process. Defaults to <code>SIGTERM</code>.</p></dd>
+<dt><code>-s</code>, <code>--signal</code> <var>SIGNAL</var></dt><dd><p>Sends the specified signal (e.g. <code>SIGKILl</code>) to the child process. Defaults to <code>SIGTERM</code>.</p></dd>
 <dt><code>-i</code>, <code>--ignore</code> <var>pattern</var></dt><dd><p>Ignores modifications from paths that match <var>pattern</var>. This option can be specified multiple times, and a match on any pattern causes the path to be ignored.</p></dd>
 <dt><code>-w</code>, <code>--watch</code> <var>path</var></dt><dd><p>Monitor a specific path for changes. By default, the current working directory is watched. This may be specified multiple times, where a change in any watched directory (and subdirectories) causes <var>command</var> to be executed.</p></dd>
 <dt><code>-r</code>, <code>--restart</code></dt><dd><p>Terminates the child process group if it is still running when subsequent file modifications are detected. By default, sends <code>SIGTERM</code>; use <code>--kill</code> to send <code>SIGKILL</code>.</p></dd>