docs,wifi: Remove emacs lines

doc/contributing/source/general.rst

@@ -95,7 +95,6 @@ the previous copyrights from the copyright file!  See below for this case.
 An example placement of a copyright statement can be found in the file
 ``src/network/model/packet.h``::
 
-  /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
   /*
    * Copyright (c) 2005,2006 INRIA
    *
@@ -112,7 +111,6 @@ contributor may add a copyright statement that clarifies the new portion
 of code that is covered by the new copyright.  An example is the program
 ``src/lte/model/lte-ue-phy.h``::
 
-  /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
   /*
    * Copyright (c) 2010 TELEMATICS LAB, DEE - Politecnico di Bari
    * Copyright (c) 2018 Fraunhofer ESK : RLF extensions

doc/manual/source/working-with-cmake.rst

@@ -423,8 +423,6 @@ We are going to use the aodv module as an example:
 
 .. sourcecode:: python3
 
-  ## -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
-
   def build(bld):
     module = bld.create_ns3_module('aodv', ['internet', 'wifi'])
     module.includes = '.'
@@ -521,8 +519,6 @@ steps. We should have something like the following:
 
 .. sourcecode:: python3
 
-  ## -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
-
   def build(bld):
       obj = bld.create_ns3_program('aodv',
                                    ['wifi', 'internet', 'aodv', 'internet-apps'])

doc/tutorial/source/conceptual-overview.rst

@@ -168,30 +168,8 @@ point-to-point link between two nodes and echo a single packet between the
 nodes.  Let's take a look at that script line by line, so go ahead and open
 ``first.cc`` in your favorite editor.
 
-Boilerplate
-+++++++++++
-The first line in the file is an emacs mode line.  This tells emacs about the
-formatting conventions (coding style) we use in our source code.
-
-::
-
-  /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-
-This is always a somewhat controversial subject, so we might as well get it
-out of the way immediately.  The |ns3| project, like most large
-projects, has adopted a coding style to which all contributed code must
-adhere.  If you want to contribute your code to the project, you will
-eventually have to conform to the |ns3| coding standard as described
-in the file ``doc/contributing/source/coding-style.rst`` or shown on the project web page
-`here
-<https://www.nsnam.org/docs/contributing/html/coding-style.html>`_.
-
-We recommend that you, well, just get used to the look and feel of |ns3|
-code and adopt this standard whenever you are working with our code.  All of
-the development team and contributors have done so with various amounts of
-grumbling.  The emacs mode line above makes it easier to get the formatting
-correct if you use the emacs editor.
-
+Copyright
++++++++++
 The |ns3| simulator is licensed using the GNU General Public
 License version 2.  You will see the appropriate GNU legalese at the head of every file
 in the |ns3| distribution.  Often you will see a copyright notice for

doc/tutorial/source/tracing.rst

@@ -313,7 +313,6 @@ We have provided some code to implement what is really the simplest
 example of tracing that can be assembled.  You can find this code in
 the tutorial directory as ``fourth.cc``.  Let's walk through it::
 
-  /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
   /*
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU General Public License version 2 as
@@ -1390,7 +1389,6 @@ dissecting the congestion window test.  Open
 ``examples/tutorial/fifth.cc`` in your favorite editor.  You should
 see some familiar looking code::
 
-  /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
   /*
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU General Public License version 2 as

src/wifi/test/80211b.c

@@ -1,4 +1,3 @@
-/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
  * Copyright (c) 2010 The Boeing Company
  *