two minor typos

Author: eddelbuettel

inst/NEWS.Rd

@@ -19,7 +19,7 @@
       \item Sorting is now prohibited at compile time for objects of type
       \code{List}, \code{RawVector} and \code{ExpressionVector}.
       \item Vectors now have a \code{Vector::const\_iterator} that is 'const correct'
-      thanks to fix by Romain following bug report in rcpp-devel by Martyn Plummer.
+      thanks to fix by Romain following a bug report in rcpp-devel by Martyn Plummer.
       \item The \code{mean()} sugar function now uses a more robust two-pass
       method, and new unit tests for \code{mean()} were added at the same time.
       \item The \code{mean()} and \code{var()} functions now support all core
@@ -28,7 +28,7 @@
       suggestion by Qiang Kou following a bug report by Søren Højsgaard.
       \item The macros \code{major}, \code{minor}, and \code{makedev} no longer leak
       in from the (Linux) system header \code{sys/sysmacros.h}.
-      \item The \code{push_front()} string function was corrected..
+      \item The \code{push_front()} string function was corrected.
     }
     \item Changes in Rcpp Attributes:
     \itemize{