mention wxRmDir() and its opposite return value meaning in wxRmdir() description (bug 1614494)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43980 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/function.tex

@@ -1273,6 +1273,11 @@ Removes the directory {\it dir}, returning true if successful. Does not work und
 
 The {\it flags} parameter is reserved for future use.
 
+Please notice that there is also a wxRmDir() function which simply wraps the
+standard POSIX rmdir() function and so return an integer error code instead of
+a boolean value (but otherwise is currently identical to wxRmdir), don't
+confuse these two functions.
+
 
 \membersection{::wxSetWorkingDirectory}\label{wxsetworkingdirectory}