style: add new line add end of files

chapters/about.md

@@ -17,4 +17,4 @@ contribute!\
 \
 **Status**: This document is a living document and will be extended as soon as the Software Quality Working Group has
 agreed upon a new standard for software projects in RDD.
-TODOs and addenda of this document are maintained [here](https://github.com/subugoe/rdd-technical-reference/issues/).
+TODOs and addenda of this document are maintained [here](https://github.com/subugoe/rdd-technical-reference/issues/).
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chapters/explanatory-notes.md

@@ -7,4 +7,4 @@ metric which suits our needs. [CESSDA](https://www.cessda.eu/) is one of the ERI
 Sciences it has similar requirements regarding its software.
 
 Throughout the document you will find sections with the heading "CESSDA's Software Maturity Levels in RDD" in which we
-describe which of the SMLs we aim for and how we want to implement it.
+describe which of the SMLs we aim for and how we want to implement it.
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chapters/links.md

@@ -20,4 +20,4 @@
 <http://softwaretestingfundamentals.com/software-testing-levels>
 
 - Netherlands eScience Center Guide\
-<https://guide.esciencecenter.nl>
+<https://guide.esciencecenter.nl>
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chapters/retirement.md

 
 ## Retirement of Software
 
-- clarify if software is no longer supported
+- clarify if software is no longer supported
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