Define more tasks at the PR template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -1,21 +1,24 @@
 ## Description of the changes
-
+_A brief description of what has been modified in the system._
 
 ### Affected components
-
+_e.g. WCS adapter, the Apollo 11 integration, k.Explorer..._
 
 ### Related issues
-Link here any Pull Request, issue, confluence page or Asana task related to this Pull Request?
+_Link here any Pull Request, issue, confluence page or Asana task related to this Pull Request?_
 
 
 ## Checklist
 - [ ] Successful build and test (Github build)
 - [ ] Successful continuous integration (Jenkins)
 - [ ] The modified code has been properly formated
+- [ ] Is the documentation up to date?
 
 
 ## How can this changes be validated?
 Write a step by step guide of what should be done to validate these changes:
+1. Step 1
+2. Step 2
 
 
 ### Other things to have in mind