docs(cinfig): remove edition title from oar.title list

oaipmh-webapp/src/main/webapp/WEB-INF/oaipmh.textgrid.properties

@@ -51,7 +51,8 @@ workFields = created, work.abstract, relations.isDerivedFrom, textgridUri, work.
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 oar.identifierField = pid.value
-oar.titleFields = title, edition.source.bibliographicCitation.editionTitle
+# edition title can not be mapped to schema, titleType=OTHER is not supported in OpenAIRE: edition.source.bibliographicCitation.editionTitle
+oar.titleFields = title
 oar.dateFields = created, issued, lastModified
 oar.contributorFields = dataContributor, project
 oar.creatorFields = TODO