Capitalize first letter of an explanation for a \versionchanged
annotation.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index e7683ce..6ea9349 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -785,7 +785,7 @@
 times are set to the current time.  Otherwise, \var{times} must be a
 2-tuple of numbers, of the form \code{(\var{atime}, \var{mtime})}
 which is used to set the access and modified times, respectively.
-\versionchanged[added support for \code{None} for \var{times}]{2.0}
+\versionchanged[Added support for \code{None} for \var{times}]{2.0}
 Availability: Macintosh, \UNIX{}, Windows.
 \end{funcdesc}