Wal-Mart Keeps Same-Store Sales Outlook  CHICAGO (Reuters) - Wal-Mart Stores Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=WMT.N target=/stocks/quickinfo/fullquote"&gt;WMT.N&lt;/A&gt;, the  world's largest retailer, said on Saturday it still sees a 2 to  4 percent increase in October sales at its stores open at least  a year.