fix wording

Author: Vladimir Kotal

file-api.tex

@@ -1008,7 +1008,7 @@
 However, it is not part of SUSv4 and thus not portable, unfortunately.
 The portable way is to call \texttt{stat} on each directory entry.
 \item \texttt{rmdir} does not work on directories that are not empty.  You have
-to remove all entries before you can delete a directory.  You you use 
+to remove all entries before you can delete a directory.  You can use
 \texttt{system("rm -r xxx")} etc. but be careful to sanitize the environment and
 the directory name to avoid any security implications.
 \item \label{REMOVE} The specification also defines \texttt{remove} which
@@ -1030,7 +1030,7 @@
         while(de = \emprg{readdir}(d))
             printf("%s\bs{}n", de->d_name);
         \emprg{closedir}(d);
-    \} 
+    \}
     return (0);
 \}
 \end{alltt}