[Rd] Typo in NEWS file for R-devel

[Erich Neuwirth]

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

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