fix: resolver api schema inconsistency

Signed-off-by: Clément Humbert <clement.humbert@sicpa.com>

Author: chumbert

aries_cloudagent/resolver/routes.py

@@ -53,7 +53,7 @@
 class ResolutionResultSchema(OpenAPISchema):
     """Result schema for did document query."""
 
-    did_doc = fields.Dict(description="DID Document", required=True)
+    did_document = fields.Dict(description="DID Document", required=True)
     metadata = fields.Dict(description="Resolution metadata", required=True)