chore: update local environment configuration (#655)

Signed-off-by: advay-sinha <advaysinhaa@gmail.com>

Author: advay-sinha

.env.example

@@ -1,5 +1,5 @@
-OPERATOR_ID=<YOUR_OPERATOR_ID> #your private key, can be retrived from https://portal.hedera.com/dashboard
-OPERATOR_KEY=<YOUR_PRIVATE_KEY> # your account id, can be retrieved from https://portal.hedera.com/dashboard
+OPERATOR_ID=<YOUR_OPERATOR_ID> #your account id, can be retrived from https://portal.hedera.com/dashboard
+OPERATOR_KEY=<YOUR_PRIVATE_KEY> #your testnet private key, can be retrieved from https://portal.hedera.com/dashboard
 NETWORK=<NETWORK> #eg testnet/previewnet/mainnet
 
 # RECIPIENT_ID=<RECIPIENT_ID> #optional

CHANGELOG.md

@@ -16,7 +16,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 
 ### Changed
 - chore: validate that token airdrop transactions require an available token service on the channel (#632) 
-
+- chore: update local environment configuration in env.example (#649)
 - chore: fix type hint for TokenCancelAirdropTransaction pending_airdrops parameter
 - chore: Moved documentation file `common_issues.md` from `examples/sdk_developers/` to `docs/sdk_developers/` for unified documentation management (#516).