title: Change hanging indentation for LaTeX description environment
body: <p>I am using the <code>memoir</code> document class for a book.  It formats items in a <code>description</code> environment like this:</p>
  
  <pre><code>THE TERM has a long definition that may run
        on for quite some time.
  </code></pre>
  
  <p>I would like to reduce the hanging indent for all <code>description</code> environments to 2em <em>without</em> defining a new environment (so that I don't have to modify any of the <code>.tex</code> files I am assembling into a whole).  What commands can I add to my preamble, or what <code>\renewcommand</code>s can I use, to do this?  The desired output is:</p>
  
  <pre><code>THE TERM has a long definition that may run
    on for quite some time.
  </code></pre>