feat: Update mentor assignment welcome message (Fixes #1487)#1488

exploreriii merged 2 commits intohiero-ledger:mainhiero-ledger/hiero-sdk-python:mainfrom

MohamedSharfan:fix/issue-1487-update-welcome-messageMohamedSharfan/hiero-sdk-python:fix/issue-1487-update-welcome-messageCopy head branch name to clipboard