Issue Candidate: env naming and clarity in README or examples

[exploreriii]

README.md points to

# Account that will pay query and transaction fees.
OPERATOR_ID=
# Default private key to use to sign for all transactions and queries.
OPERATOR_KEY=

https://github.com/hiero-ledger/hiero-sdk-rust?tab=readme-ov-file

However, at least some examples require different env variables:

     Running `target/release/examples/account_alias`
error: the following required arguments were not provided:
  --operator-account-id <OPERATOR_ACCOUNT_ID>

also despite Usage: account_alias --operator-account-id <OPERATOR_ACCOUNT_ID> --operator-key <OPERATOR_KEY>
i have a sign error

This was resolved by not using a ECDSA key and instead a ed25519 key

[gsstoykov]

Fair, will resolve include this in the following sprint.