Double space --> single space

Author: jamesray1

CONTRIBUTING.md

@@ -15,7 +15,7 @@ The title of the page should start with [Language]: title, e.g. "[German] White
 
 ### License and [contributor license agreement](https://github.com/ethereum/wiki/wiki/CC0-license#list-of-contributors)
 
-Please permit your contributions to be under the [CC0 license](https://creativecommons.org/publicdomain/zero/1.0/legalcode) [1](https://creativecommons.org/share-your-work/public-domain/cc0/),  which makes your contributions have no rights reserved, putting them in the public domain. This will help to allow for the dissemination of information about Ethereum, the Ethereum ecosystem and Web 3 to the public, in a completely permissive manner. To state that you accept your contributions to be under a CC0 license, please add yourself to the list of external contributors [here](https://github.com/ethereum/wiki/wiki/CC0-license#list-of-contributors). Otherwise, without adding yourself to the list, your contributions will be all rights reserved. Some previous contributions may have all rights reserved (by contributors that have not agreed to a CC0 license [at pull request 528](https://github.com/ethereum/wiki/pull/528)), since no copyright permission was stated explicitly. Until all previous contributors agree to a CC0 license, and to provide clarity of licensing, you may also wish to add a HTML comment to the top of pages or sections that you contribute to, like so: `<!--*Name Surname*, Github username, **email@domain** and/or other contact methods-->`.
+Please permit your contributions to be under the [CC0 license](https://creativecommons.org/publicdomain/zero/1.0/legalcode) [1](https://creativecommons.org/share-your-work/public-domain/cc0/), which makes your contributions have no rights reserved, putting them in the public domain. This will help to allow for the dissemination of information about Ethereum, the Ethereum ecosystem and Web 3 to the public, in a completely permissive manner. To state that you accept your contributions to be under a CC0 license, please add yourself to the list of external contributors [here](https://github.com/ethereum/wiki/wiki/CC0-license#list-of-contributors). Otherwise, without adding yourself to the list, your contributions will be all rights reserved. Some previous contributions may have all rights reserved (by contributors that have not agreed to a CC0 license [at pull request 528](https://github.com/ethereum/wiki/pull/528)), since no copyright permission was stated explicitly. Until all previous contributors agree to a CC0 license, and to provide clarity of licensing, you may also wish to add a HTML comment to the top of pages or sections that you contribute to, like so: `<!--*Name Surname*, Github username, **email@domain** and/or other contact methods-->`.
 
 For more information, see https://github.com/ethereum/wiki/wiki.