Update CONTRIBUTING.md (#425)

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

CONTRIBUTING.md

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 # Contributing
 
 The documentation and benchmarking of Qiskit is contained in this repository. To contribute
-to them please read the
-[contributing guide](https://qiskit.org/documentation/contributing_to_qiskit.html):
+to this project or any of the elements of qiskit we recomend you start by reading the
+[contributing guide](https://qiskit.org/documentation/contributing_to_qiskit.html).
 
 ## Contributor License Agreement
 
-We'd love to accept your code! Before we can, we have to get a few legal
-requirements sorted out. By having you sign a Contributor License Agreement (CLA), we
-ensure that the community is free to use your contributions.
+Before you can submit any code we need all contributors to sign a
+contributor license agreement. By signing a contributor license
+agreement (CLA) you're basically just attesting to the fact
+that you are the author of the contribution and that you're freely
+contributing it under the terms of the Apache-2.0 license.
 
-When you contribute to the Qiskit project with a new pull request, a bot will
-evaluate whether you have signed the CLA. If required, the bot will comment on
-the pull request,  including a link to accept the agreement. The
-[individual CLA](https://qiskit.org/license/qiskit-cla.pdf) document is
-available for review as a PDF.
+When you contribute to the Qiskit project with a new pull request,
+a bot will evaluate whether you have signed the CLA. If required, the
+bot will comment on the pull request, including a link to accept the
+agreement. The [individual CLA](https://qiskit.org/license/qiskit-cla.pdf)
+document is available for review as a PDF.
+
+**Note**:
+> If your contribution is part of your employment or your contribution
+> is the property of your employer, then you will likely need to sign a
+> [corporate CLA](https://qiskit.org/license/qiskit-corporate-cla.pdf) too and
+> email it to us at <[email protected]>.
 
-If you work for a company that wants to allow you to contribute your work,
-then you'll need to sign a [corporate CLA](https://qiskit.org/license/qiskit-corporate-cla.pdf)
-and email it to us at [email protected].
 
 ## Documentation
 
 The documentation of Qiskit is in the ``docs`` directory. The
-documentation is generated using [Sphinx](http://www.sphinx-doc.org). In the main directory are the installing and general files and then in each subdirectory contains documentation for each element of Qiskit. Once a pull request is accepted the documentation will be auto-generated and rendered at [https://qiskit.org/documentation](https://qiskit.org/documentation).
+documentation is generated using [Sphinx](http://www.sphinx-doc.org). In the main directory are the installing and general files. Once a pull request is accepted the documentation will be auto-generated and rendered at [https://qiskit.org/documentation](https://qiskit.org/documentation).
 
 To edit the documentation, edit the rst files directly and then a html version can be made using: