[Rd] Typo in NEWS file for R-devel

[Martin Maechler]

>>>>> Erich Neuwirth <erich.neuwirth at univie.ac.at>
>>>>>     on Sun, 1 May 2016 23:40:40 +0200 writes:

    > From the first page of the NEWS file: (2016-04-29 r70564)

    > isSymmetrix(m) is much faster for large asymmetric
    > matrices m via pre-tests and a new option tol1 (with which
    > strict back compatibility is possible but not the
    > default).

    > It probably should be isSymmetric

Indeed; now fixed.  Thank you!