Calpers Tendered Its PeopleSoft Shares  SAN FRANCISCO (Reuters) - Calpers, the biggest U.S. pension  fund, said on Thursday that it had tendered its 1.5 million  shares of PeopleSoft Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=PSFT.O target=/stocks/quickinfo/fullquote"&gt;PSFT.O&lt;/A&gt; to Oracle Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=ORCL.O target=/stocks/quickinfo/fullquote"&gt;ORCL.O&lt;/A&gt;,  accepting its \$8.8 billion hostile takeover bid.