Fix incorrect signed transaction hash in create-phase1-staking.md

[meetrick]

This commit updates the create-phase1-staking.md documentation to correct the signed transaction hash in the example command for sending a raw transaction using bitcoin-cli.

Changes:

• Replaced the incorrect signed transaction hash with the correct one in the sendrawtransaction command example.

This correction ensures the example provided is accurate, preventing potential issues for users following the documentation.

[RafilxTenfen]

@filippos47 the build_docker is necessary to pass?