UPDATE: ZM-RNGO - unnecessary text in example identifiers

[emmajclegg]

Update: https://org-id.guide/list/ZM-RNGO

• The example identifier should most likely be "ZM-RNGO-1010147", without the duplicated RNGO (this is consistent with the references of previously registered IATI organisations in Zambia)

[emmajclegg]

Fixed via #698