Moved buildDescriptionParagraph method ino MarkupDocumentBuilder so that it can be reused by all other builders.

src/main/java/io/github/robwin/swagger2markup/internal/document/builder/MarkupDocumentBuilder.java

@@ -41,6 +41,7 @@ import java.util.*;
 
 import static io.github.robwin.swagger2markup.internal.utils.MapUtils.toKeySet;
 import static org.apache.commons.lang3.StringUtils.defaultString;
+import static org.apache.commons.lang3.StringUtils.isNotBlank;
 
 /**
  * @author Robert Winkler
@@ -153,6 +154,12 @@ public abstract class MarkupDocumentBuilder {
         return localDefinitions;
     }
 
+    protected void buildDescriptionParagraph(String description) {
+        if(isNotBlank(description)){
+            this.markupDocBuilder.paragraph(description);
+        }
+    }
+
     /**
      * A functor to return descriptions for a given property
      */