[Docs] Git Install Updates, note about launcher deprecation, capitalise some words (#2998)

* commit

* add launcher depricate to linix/mac

* sorry linux i still ignored you

capitalise some linix stuff i couldnt be bothered to do before

* remove mentions of launcher & update changelog enrty

docs/install_linux_mac.rst

@@ -18,8 +18,8 @@ Please install the pre-requirements using the commands listed for your operating
 
 The pre-requirements are:
  - Python 3.7.0 or greater
- - pip 9.0 or greater
- - git
+ - Pip 9.0 or greater
+ - Git
  - Java Runtime Environment 8 or later (for audio support)
 
 We also recommend installing some basic compiler tools, in case our dependencies don't provide
@@ -316,12 +316,3 @@ It will walk through the initial setup, asking for your token and a prefix.
 You can find out how to obtain a token with
 `this guide <https://discordpy.readthedocs.io/en/v1.0.1/discord.html#creating-a-bot-account>`_,
 section "Creating a Bot Account".
-
-You may also run Red via the launcher, which allows you to restart the bot
-from discord, and enable auto-restart. You may also update the bot from the
-launcher menu. Use the following command to run the launcher:
-
-.. code-block:: none
-
-    redbot-launcher
-