Merge pull request #375 from github/probot-dco

Swap DCO link for one with documentation

Author: Nadia Eghbal

_articles/getting-paid.md

@@ -79,7 +79,7 @@ If you don't have an existing open source project you'd like to work on, but wou
 
 Many companies are developing open source programs to build their brand and recruit quality talent.
 
-@hueniverse, for example, found that there were financial reasons to justify [Walmart's investment in open source](https://hueniverse.com/2014/08/15/open-source-aint-charity/). And @jamesgpearce found that Facebook's open source program [made a difference](https://opensource.com/business/14/10/head-of-open-source-facebook-oscon) in recruiting:
+@hueniverse, for example, found that there were financial reasons to justify [Walmart's investment in open source](http://www.infoworld.com/article/2608897/open-source-software/walmart-s-investment-in-open-source-isn-t-cheap.html). And @jamesgpearce found that Facebook's open source program [made a difference](https://opensource.com/business/14/10/head-of-open-source-facebook-oscon) in recruiting:
 
 > It is closely aligned with our hacker culture, and how our organization was perceived. We asked our employees, "Were you aware of the open source software program at Facebook?". Two-thirds said "Yes". One-half said that the program positively contributed to their decision to work for us. These are not marginal numbers, and I hope, a trend that continues.
 

_articles/legal.md

@@ -108,8 +108,8 @@ Also, by adding "paperwork" that some believe is unnecessary, hard to understand
 
 Some situations where you may want to consider an additional contributor agreement for your project include:
 
-* Your lawyers want all contributors to expressly accept (_sign_, online or offline) contribution terms, perhaps because they feel the open source license itself is not enough (even though it is!). If this is the only concern, a contributor agreement that affirms the project's open source license should be enough. The [jQuery Individual Contributor License Agreement](https://contribute.jquery.org/CLA/) is a good example of a lightweight additional contributor agreement. For some projects, a [Developer Certificate of Origin](http://developercertificate.org/) can be an even simpler alternative.
-* Your project uses an open source license that does not include an express patent grant (such as MIT), and you need a patent grant from all contributors, some of whom may work for companies with large patent portfolios that could be used to target you or the project's other contributors and users. The [Apache Individual Contributor License Agreement](https://www.apache.org/licenses/icla.txt) is a commonly used additional contributor agreement that has a patent grant mirroring the one found in the Apache License 2.0.
+* Your lawyers want all contributors to expressly accept (_sign_, online or offline) contribution terms, perhaps because they feel the open source license itself is not enough (even though it is!). If this is the only concern, a contributor agreement that affirms the project's open source license should be enough. The [jQuery Individual Contributor License Agreement](https://contribute.jquery.org/CLA/) is a good example of a lightweight additional contributor agreement. For some projects, a [Developer Certificate of Origin](https://github.com/probot/dco) can be an even simpler alternative.
+* Your project uses an open source license that does not include an express patent grant (such as MIT), and you need a patent grant from all contributors, some of whom may work for companies with large patent portfolios that could be used to target you or the project's other contributors and users. The [Apache Individual Contributor License Agreement](https://www.apache.org/licenses/icla.pdf) is a commonly used additional contributor agreement that has a patent grant mirroring the one found in the Apache License 2.0.
 * Your project is under a copyleft license, but you also need to distribute a proprietary version of the project. You'll need every contributor to assign copyright to you or grant you (but not the public) a permissive license. The [MongoDB Contributor Agreement](https://www.mongodb.com/legal/contributor-agreement) is an example this type of agreement.
 * You think your project might need to change licenses over its lifetime and want contributors to agree in advance to such changes.