update man page to reflect XDG disrespect :)

docs/man/ipython.1

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 .SH NAME
 ipython \- Tools for Interactive Computing in Python.
 .SH SYNOPSIS
 .B ipython
 .RI [ options ] " files" ...
 
 .B ipython subcommand
 .RI [ options ] ...
 
 .SH DESCRIPTION
 An interactive Python shell with automatic history (input and output), dynamic
 object introspection, easier configuration, command completion, access to the
 system shell, integration with numerical and scientific computing tools,
 web notebook, Qt console, and more.
 
 For more information on how to use IPython, see 'ipython \-\-help',
 or 'ipython \-\-help\-all' for all available command\(hyline options.
 
 .SH "ENVIRONMENT VARIABLES"
 .sp
 .PP
 \fIIPYTHONDIR\fR
 .RS 4
 This is the location where IPython stores all its configuration files.  The default
-on most platforms is $HOME/.ipython, but on Linux IPython respects the XDG config
-specification, which will put IPYTHONDIR in $HOME/.config/ipython by default.
+is $HOME/.ipython if IPYTHONDIR is not defined.
 
 You can see the computed value of IPYTHONDIR with `ipython locate`.
 
 .SH FILES
 
 IPython uses various configuration files stored in profiles within IPYTHONDIR.
 To generate the default configuration files and start configuring IPython,
 do 'ipython profile create', and edit '*_config.py' files located in
 IPYTHONDIR/profile_default.
 
 .SH AUTHORS
 IPython is written by the IPython Development Team <https://github.com/ipython/ipython>.