Documentation Refactoring in existing documentation

entity/Contact_entity/documentation.adoc

+= Contact_entity
+
 Represents a Contact without detail information to Organisations/Persons
\ No newline at end of file

entity/Context_entity/documentation.adoc

-== Context_entity ==
+= Context_entity
 
 This Entity provides access to contexts.
 

entity/Countries_Entity/documentation.adoc

-=== Purpose of this Entity
+= Countries_Entity
 
 The `Countries_Entity` is used for keeping information about the Countries of the world.
 It could be easily extend to hold information like: