* doc/tar.texi (Option Summary): Fix xref typo.

Reported by Nathan Stratton Treadway in
<http://lists.gnu.org/archive/html/bug-tar/2012-04/msg00035.html>.

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doc/tar.texi

@@ -2756,7 +2756,7 @@ Ignore exit codes of subprocesses. @xref{Writing to an External Program}.
 @item --ignore-failed-read
 
 Do not exit unsuccessfully merely because an unreadable file was encountered.
-@xref{Reading}.
+@xref{Ignore Failed Read}.
 
 @opsummary{ignore-zeros}
 @item --ignore-zeros