Documentation Refactoring Keyword

entity/KeywordAttributeRelation_entity/documentation.adoc

+= KeywordAttributeRelation_entity
+
 This entity represents the relation between a Keyword-Attribute and a Keyword-Entry.
 There is a reference to a Keyword-Attribute, a Keyword-Entry and some more properties that describe that relation (like the stored value).
 In fact the main reason for this is the stored value which depends on the type of the Keyword-Attribute.
\ No newline at end of file

entity/KeywordAttribute_entity/documentation.adoc

-Keyword Attributes
-==================
+= Keyword Attributes
 
 Keyword attributes are an extension of simple keywords.
 You can specify special attributes per Keyword-container. 

entity/KeywordEntry_entity/documentation.adoc

-Keyword
-=======
+= Keyword
+
 :toc:
 
 Simply said: A keyword is a list of key-value pairs.