Use PEP 508's req @ url syntax instead of deprecated egg fragments (#6408)

.github/workflows/lint_python.yaml

@@ -20,7 +20,11 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: "3.8"
-      - run: "python -m pip install git+https://github.com/pycqa/pyflakes@1911c20#egg=pyflakes git+https://github.com/pycqa/pycodestyle@d219c68#egg=pycodestyle git+https://github.com/pycqa/flake8@3.7.9#egg=flake8"
+      - run: >
+          python -m pip install
+          'pyflakes @ https://github.com/pycqa/pyflakes/tarball/1911c20'
+          'pycodestyle @ https://github.com/pycqa/pycodestyle/tarball/d219c68'
+          'flake8 @ https://github.com/pycqa/flake8/tarball/3.7.9'
         name: Install Flake8
       - run: "python -m flake8 . --count --select=E9,F7,F82 --show-source"
         name: Flake8 Linting

docs/guide_cog_creation.rst

@@ -31,7 +31,7 @@ Open a terminal or command prompt and type one of the following
 .. note::
 
   To install the development version, replace ``Red-DiscordBot`` in the above commands with the
-  link below. **The development version of the bot contains experimental changes. It is not
+  value below. **The development version of the bot contains experimental changes. It is not
   intended for normal users.** We will not support anyone using the development version in any
   support channels. Using the development version may break third party cogs and not all core
   commands may work. Downgrading to stable after installing the development version may cause
@@ -40,7 +40,7 @@ Open a terminal or command prompt and type one of the following
 
   .. code-block:: none
 
-      git+https://github.com/Cog-Creators/Red-DiscordBot@V3/develop#egg=Red-DiscordBot
+      Red-DiscordBot @ https://github.com/Cog-Creators/Red-DiscordBot/tarball/V3/develop
 
 
 (Windows users may need to use :code:`py -3.8` or :code:`python` instead of :code:`python3.8`)