Emphasize that wxStandardPaths must not be created directly.

wxStandardPaths::Get() must be used instead as the correct object to use might
have a different type.

See #11239.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68462 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/stdpaths.h

@@ -12,6 +12,13 @@
     wxStandardPaths returns the standard locations in the file system and should be
     used by applications to find their data files in a portable way.
 
+    Note that you must not create objects of class wxStandardPaths directly,
+    but use the global standard paths object returned by wxStandardPaths::Get()
+    (which can be of a type derived from wxStandardPaths and not of exactly
+    this type) and call the methods you need on it. The object returned by
+    Get() may be customized by overriding wxAppTraits::GetStandardPaths()
+    methods.
+
     In the description of the methods below, the example return values are given
     for the Unix, Windows and Mac OS X systems, however please note that these are
     just the examples and the actual values may differ. For example, under Windows:
@@ -42,10 +49,6 @@
     This class is MT-safe: its methods may be called concurrently from different
     threads without additional locking.
 
-    Note that you don't allocate an instance of class wxStandardPaths, but retrieve the
-    global standard paths object using @c wxStandardPaths::Get on which you call the
-    desired methods.
-
     @library{wxbase}
     @category{file}