Update commit requirements in Contributing page.

Removing the 'Signed-off-by' requirement as it isn't listed in the
Eclipse Project Handbook anymore.

CONTRIBUTING.md

@@ -5,18 +5,18 @@ We welcome your additions to this project.
 
 ## Eclipse Contributor Agreement
 
-Before your contribution can be accepted by the project team contributors must
+In order to be able to contribute to Eclipse Foundation projects you must
 electronically sign the Eclipse Contributor Agreement (ECA).
 
-* https://accounts.eclipse.org/user/eca
+* https://www.eclipse.org/legal/ECA.php
 
-Commits that are provided by non-committers must have a Signed-off-by field in
-the footer indicating that the author is aware of the terms by which the
-contribution has been provided to the project. The non-committer must
-additionally have an Eclipse Foundation account and must have a signed Eclipse
-Contributor Agreement (ECA) on file.
+The ECA provides the Eclipse Foundation with a permanent record that you agree
+that each of your contributions will comply with the commitments documented in
+the Developer Certificate of Origin (DCO). Having an ECA on file associated with
+the email address matching the "Author" field of your contribution's Git commits
+fulfills the DCO's requirement that you sign-off on your contributions.
 
-For more information, please see the Eclipse Committer Handbook:
+For more information, please see the Eclipse Project Handbook:
 https://www.eclipse.org/projects/handbook/#resources-commit
 
 ## Making your Changes

homepage/contribute.md

@@ -146,5 +146,5 @@ If you plan on contributing code, you will need to
 and [sign the Eclipse Contributor Agreement](https://accounts.eclipse.org/user/eca).
 
 Is this required? Yes! Is there a way around it? No! Why is this necessary? Because legal
-issues are as though as software engineering issues, and this is the way to solve them.
+issues are as tough as software engineering issues, and this is the way to solve them.