LWG3079 LWG 2935 forgot to fix the existing_p overloads of create_directory

Author: jensmaurer

source/iostreams.tex

@@ -14800,21 +14800,18 @@
 
 \begin{itemdescr}
 \pnum
-\effects Establishes the postcondition by attempting to create the
+\effects Creates the
   directory \tcode{p} resolves to, with
   attributes copied from directory \tcode{existing_p}. The set of attributes
-  copied is operating system dependent. Creation failure because \tcode{p} resolves to an existing directory shall not be
-  treated as an error.
+  copied is operating system dependent.
+  Creation failure because \tcode{p} already exists is not an error.
 \begin{note} For POSIX-based operating systems, the
       attributes are those copied by native API \tcode{stat(existing_p.c_str(), \&attributes_stat)}
       followed by \tcode{mkdir(p.c_str(), attributes_stat.st_mode)}. For
       Windows-based operating systems, the attributes are those copied by native
       API \tcode{CreateDirectoryExW(existing_p.c_str(), p.c_str(), 0)}.
 \end{note}
 
-\pnum
-\postconditions \tcode{is_directory(p)}.
-
 \pnum
 \returns \tcode{true} if a new directory was created, otherwise \tcode{false}.
   The signature with argument \tcode{ec} returns \tcode{false} if an error occurs.