Update some external links on the docs (#5943)

* Fix broken URLs on docs

* Adjust pip URL so header is highlighted

* Update URL for TOML specs

docs/advanced.md

@@ -234,7 +234,7 @@ Example:
 
 Note
 
-Each month, [PyUp.io](https://pyup.io>)updates the `safety` database of insecure Python packages and [makes it available to the open source community for free](https://pyup.io/safety/). Each time you run `pipenv check` to show you vulnerable dependencies,
+Each month, [PyUp.io](https://pyup.io) updates the `safety` database of insecure Python packages and [makes it available to the open source community for free](https://pyup.io/safety/). Each time you run `pipenv check` to show you vulnerable dependencies,
 Pipenv makes an API call to retrieve and use those results.
 
 For more up-to-date vulnerability data, you may also use your own safety API key by setting the environment variable `PIPENV_PYUP_API_KEY`.

docs/pipfile.md

@@ -2,7 +2,7 @@
 
 `Pipfile` contains the specification for the project top-level requirements and any desired specifiers.
 This file is managed by the developers invoking pipenv commands.
-The `Pipfile` uses inline tables and the [TOML Spec](https://github.com/toml-lang/toml#user-content-spec>).
+The `Pipfile` uses inline tables and the [TOML Spec](https://toml.io/en/latest#spec).
 
 `Pipfile.lock` replaces the `requirements.txt` file used in most Python projects and adds
 security benefits of tracking the packages hashes that were last locked.

docs/shell.md

@@ -43,7 +43,7 @@ To prevent pipenv from loading the `.env` file, set the `PIPENV_DONT_LOAD_ENV` e
 
     $ PIPENV_DONT_LOAD_ENV=1 pipenv shell
 
-See [theskumar/python-dotenv](https://github.com/theskumar/python-dotenv>) for more information on `.env` files.
+See [theskumar/python-dotenv](https://github.com/theskumar/python-dotenv) for more information on `.env` files.
 
 ## Shell Completion
 

docs/workflows.md

@@ -13,7 +13,7 @@ Add a package to your project, recalibrating entire lock file using the Pipfile
     $ pipenv install <package>
 
 - Note: This will create a `Pipfile` if one doesn't exist. If one does exist, it will automatically be edited with the new package you provided, the lock file updated and the new dependencies installed.
-- `pipenv install` is fully compatible with `pip install` [package specifiers](https://pip.pypa.io/en/stable/user_guide/#installing-packages>).
+- `pipenv install` is fully compatible with `pip install` [package specifiers](https://pip.pypa.io/en/stable/user_guide/#installing-packages).
 - Additional arguments may be supplied to `pip` by supplying `pipenv` with `--extra-pip-args`.
 
 Update everything (equivalent to `pipenv lock && pipenv sync`):