Update storage-account-upgrade.md

[Ankit-MSFT]

Corrected classification of Ingress and Egress.

Ingress refers to data ingested in storage account PutBlob, PutBlock. Egress refers to data transferred from storage account, with APIs like GetBlob, CopyBlob.

The existing documented incorrectly used Ingress for read transactions and Egress for write transactions.

Reference: https://learn.microsoft.com/en-us/azure/storage/blobs/monitor-blob-storage-reference#supported-metrics-for-microsoftstoragestorageaccountsblobservices

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[Court72]

@akashdubey-ms

Can you review the proposed changes?

When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

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