Use camelCase (metafacture-core#415)

Author: dr0i

README.md

@@ -611,9 +611,9 @@ lookup("path.to.field", "map-name", print_unknown: "true", destination: "unknown
 Looks up matching values in an RDF resource and replaces the field value with this match. A file as well as an HTTP(S) resource can be used.
 
 ```perl
-lookup_rdf("<sourceField>", "<rdfResource>", target: "<RDF Property>")
-lookup_rdf("<sourceField>", "<rdfResource>", target: "<RDF Property>", target_language: "<RDF language tag>")
-lookup_rdf("<sourceField>", "<rdfResource>", target: "<RDF Property>", __default: "NA")
+lookup_rdf("<sourceField>", "<rdfResource>", target: "<rdfProperty>")
+lookup_rdf("<sourceField>", "<rdfResource>", target: "<rdfProperty>", target_language: "<rdfLanguageTag>")
+lookup_rdf("<sourceField>", "<rdfResource>", target: "<rdfProperty>", __default: "NA")
 ```
 
 ##### `prepend`