Updated metadata file to reflect current status of metadata fields

updated generatedAt and generatedBy with the 'record' prefix.

docs/metadata_standards.md

@@ -17,8 +17,8 @@ All files are in a JSON format and are broken into three core fields:
 Field Name | Definition 
 --- | --- 
 schemaVersion | Version of the metadata schema
-generatedAt | Closest time to which the record was created, either signed or received by the generatedBy source in UTC format. This information is taken from the communication header.
-generatedBy | Source of the record, whether [OBU, RSU, TMC].
+recordGeneratedAt | Closest time to which the record was created, either signed or received by the generatedBy source in UTC format. This information is taken from the communication header.
+recordGeneratedBy | Source of the record, whether [OBU, RSU, TMC].
 logFileName | Name of the original file that deposited the message into the ODE
 payloadType | ODE specific Java class identifying the type of payload included with the message
 recordType | Type of message