docs(accounting): update UpdatedDateUTCString descriptions for consistency

Author: gcxero

xero_accounting.yaml

@@ -21658,7 +21658,7 @@ components:
           example: /Date(1573755038314)/
           readOnly: true
         UpdatedDateUTCString:
-          description: Last modified date ISO-8601 UTC format
+          description: UTC ISO-8601 formatted timestamp of last update to the credit note 
           type: string
           format: date-time
           example: 2019-11-14T18:10:38Z
@@ -22495,13 +22495,13 @@ components:
           format: double
           x-is-money: true
         UpdatedDateUTC:
-          description: Last modified date UTC format
+          description: UTC timestamp of last update to the invoice
           type: string
           x-is-msdate-time: true
           example: /Date(1573755038314)/
           readOnly: true
         UpdatedDateUTCString:
-          description: Last modified date ISO-8601 UTC format
+          description: UTC ISO-8601 formatted timestamp of last update to the invoice
           type: string
           format: date-time
           example: 2019-11-14T18:10:38Z
@@ -23755,7 +23755,7 @@ components:
           example: /Date(1573755038314)/
           readOnly: true
         UpdatedDateUTCString:
-          description: Last modified date ISO-8601 UTC format
+          description: UTC ISO-8601 formatted timestamp of last update to the overpayment
           type: string
           format: date-time
           example: 2019-11-14T18:10:38Z
@@ -23910,7 +23910,7 @@ components:
           example: /Date(1573755038314)/
           readOnly: true
         UpdatedDateUTCString:
-          description: Last modified date ISO-8601 UTC format
+          description: UTC ISO-8601 formatted timestamp of last update to the payment
           type: string
           format: date-time
           example: 2019-11-14T18:10:38Z
@@ -24036,7 +24036,7 @@ components:
           example: /Date(1573755038314)/
           readOnly: true
         UpdatedDateUTCString:
-          description: Last modified date ISO-8601 UTC format
+          description: UTC ISO-8601 formatted timestamp of last update to the prepayment
           type: string
           format: date-time
           example: 2019-11-14T18:10:38Z