Update pstn-usage-report.md

[saurabhjain0804]

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Addition of one Field in the PSTN usage report Export function as below :

Administrative unit : This is a value which tells about the collection of Admin Units

Addition of two fields in the PSTN usage report export function for Direct routing report

Administrative unit : This is a value which tells about the collection of Admin Units

TransferorCorelation Id : This is a value which provides information on the correlation iD when a call gets transferred

[learn-build-service-prod[bot]]

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