Reword and clarify DCO

CONTRIBUTING.adoc

@@ -68,18 +68,23 @@ Also see link:docs/devel/readme.adoc[developer's documentation] and link:./docs/
 
 == Developer Certificate of Origin
 
-Your pull requests can be merged only if you can certify 
-the link:../DCO[Developer Certificate of Origin (DCO), Version 1.1].
-To certify DCO (e.g. sign-off your commit), you must add 
-a `Signed-off-by` line to **every**  git commit message 
-(e.g. by using `git commit -s`):
+Your pull requests and patches can be merged only if you can certify
+the link:./DCO[Developer Certificate of Origin (DCO), Version 1.1].
+
+By signing-off your commit you certify DCO and acknowlegde that you have
+the rights to submit your pull requsted or patch as an open-source patch,
+as stated in link:./DCO[Developer Certificate of Origin].
+
+Certifying DCO is done by adding a `Signed-off-by` line
+to **every** git commit message:
 
     Signed-off-by: gitlab-account <your.real@email.address>
 
-If you set your `user.name` and `user.email` in git configs,
-then git will include that line for you with `git commit -s`. 
-These settings can be done per repository basis, 
-so they don't have be global settings in your system. 
+If you set your `user.name` and `user.email` correctly in git config,
+then git will automatically include that line for you with `git commit -s`.
+You can also create a git `commit.template` with appropriate content. These
+settings can be done per repository basis,  so they don't have to be globally
+set in your system.
  
 Please make sure that you sign-off all your PR's commits.
 

README.adoc

@@ -155,18 +155,23 @@ are more likely to subject of change.
 Contributions to the project are most welcome. See
 link:./CONTRIBUTING.adoc[CONTRIBUTING] how you could help.
 
-Your pull requests can be merged only if you can certify 
+Your pull requests and patches can be merged only if you can certify
 the link:./DCO[Developer Certificate of Origin (DCO), Version 1.1].
-To certify DCO (e.g. sign-off your commit), you must add 
-a `Signed-off-by` line to **every**  git commit message 
-(e.g. by using `git commit -s`):
+
+By signing-off your commit you certify DCO and acknowlegde that you have
+the rights to submit your pull requsted or patch as an open-source patch,
+as stated in link:./DCO[Developer Certificate of Origin].
+
+Certifying DCO is done by adding a `Signed-off-by` line
+to **every** git commit message:
 
     Signed-off-by: gitlab-account <your.real@email.address>
 
-If you set your `user.name` and `user.email` in git config,
-then git will include that line for you with `git commit -s`. 
-These settings can be done per repository basis, 
-so they don't have be global settings in your system. 
+If you set your `user.name` and `user.email` correctly in git config,
+then git will automatically include that line for you with `git commit -s`.
+You can also create a git `commit.template` with appropriate content. These
+settings can be done per repository basis,  so they don't have to be globally
+set in your system.
  
 Please make sure that you sign-off all your PR's commits.