clean up HACKING.rst doc

Also fix a spelling mistake in .github/contributing.rst

.github/CONTRIBUTING.rst

@@ -1,9 +1,9 @@
-Licence Notice
+License Notice
 ==============
 
 The Salt project is open and encouraging to code contributions. Please be
 advised that all code contributions will be licensed under the Apache 2.0
-License. We cannot accept contributions that already hold a Licence other
+License. We cannot accept contributions that already hold a License other
 than Apache 2.0 without explicit exception.
 
 

HACKING.rst

@@ -16,14 +16,6 @@ Please review the following questions when creating a pull request:
 
 `<https://docs.saltstack.com/en/develop/topics/development/pull_requests.html>`_
 
-Posting patches to the mailing list
------------------------------------
-
-If you have a patch for Salt, please format it via :command:`git format-patch`
-and send it to the Salt users mailing list. This allows the patch to give you
-the contributor the credit for your patch, and gives the Salt community an
-archive of the patch and a place for discussion.
-
 Contributions Welcome!
 ----------------------
 
@@ -92,7 +84,7 @@ On Debian and derivative systems such as Ubuntu, system requirements can be
 installed by running::
 
     apt-get install -y build-essential libssl-dev python-dev python-m2crypto \
-      python-pip python-virtualenv swig virtualenvwrapper
+      python-pip python-virtualenv virtualenvwrapper
 
 RedHat-based systems
 ````````````````````
@@ -101,26 +93,13 @@ If you are developing using one of these releases, you will want to create your
 virtualenv using the ``--system-site-packages`` option so that these modules
 are available in the virtualenv.
 
-M2Crypto also supplies a fedora_setup.sh script you may use as well if you get
-the following error::
-
-    This openssl-devel package does not work your architecture?. Use the -cpperraswarn option to continue swig processing.
-
-You can use it doing the following::
-
-    cd <path-to-your-venv>/build/M2Crypto
-    chmod u+x fedora_setup.sh
-    ./fedora_setup.sh build
-    ./fedora_setup.sh install
-
 
 Installing dependencies on OS X
 ```````````````````````````````
 
 One simple way to get all needed dependencies on OS X is to use homebrew,
 and install the following packages::
 
-    brew install swig
     brew install zmq
 
 Afterward the pip commands should run without a hitch. Also be sure to set
@@ -175,14 +154,6 @@ ZeroMQ Transport:
     pip install psutil
     pip install -e .
 
-.. note:: Installing M2Crypto
-
-    You may need ``swig`` and ``libssl-dev`` to build M2Crypto. If you
-    encounter the error ``command 'swig' failed with exit status 1``
-    while installing M2Crypto, try installing it with the following command::
-
-        env SWIG_FEATURES="-cpperraswarn -includeall -D__`uname -m`__ -I/usr/include/openssl" pip install M2Crypto
-
 
 RAET Transport:
 
@@ -271,6 +242,7 @@ path. This can be done in a couple different ways:
 
 ``NOTE:`` The socket path is limited to 107 characters on Solaris and Linux,
 and 103 characters on BSD-based systems.
+
 File descriptor limit
 ~~~~~~~~~~~~~~~~~~~~~