Update 3.4.-Attributes.md

Author: qwertygc

docs/doc/en/3.4.-Attributes.md

@@ -14,7 +14,7 @@ Attributes can be added in the Manage Files, Manage Cases or Manage Journals sec
 
 Attributes can be imported from a survey, and also from an REFI-QDA project file. Note REFI-QDA project import is not guaranteed to successfully import.
 
-It is not the intention for QualCoder to perform statistical analyses of the attributes. It is preferable to use statistical software such as R (https://www.r-project.org/).
+It is not the intention for QualCoder to perform statistical analyses of the attributes. It is preferable to use statistical software such as [R](https://www.r-project.org/).
 
 Attributes can also be added or deleted using the Manage > Manage Attributes option: