fix minor markup errors
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 2e6636e..dc621dd 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -796,7 +796,7 @@
directory.
Availability: Macintosh, \UNIX, Windows.
-\versionchanged[On Windows NT/2k/XP and Unix, if \var{path} is a Unicode
+\versionchanged[On Windows NT/2k/XP and \UNIX, if \var{path} is a Unicode
object, the result will be a list of Unicode objects.]{2.3}
\end{funcdesc}
@@ -989,14 +989,14 @@
reported if the system supports that. On Mac OS, the times are always
floats. See \function{stat_float_times} for further discussion. ]{2.3}
-On some Unix systems (such as Linux), the following attributes may
+On some \UNIX{} systems (such as Linux), the following attributes may
also be available:
\member{st_blocks} (number of blocks allocated for file),
\member{st_blksize} (filesystem blocksize),
\member{st_rdev} (type of device if an inode device).
\member{st_flags} (user defined flags for file).
-On other Unix systems (such as FreeBSD), the following attributes
+On other \UNIX{} systems (such as FreeBSD), the following attributes
may be available (but may be only filled out of root tries to
use them:
\member{st_gen} (file generation number),