[docs] Add a note about timeout in "Step 5: Create the Token"

[bogniq]

File: [docs/02_getting-started/03_smart-contract-development/02_deploy-issue-and-transfer-tokens.md](https://github.com/EOSIO/welcome/blob/develop/docs/02_getting-started/03_smart-contract-development/02_deploy-issue-and-transfer-tokens.md)

When I ran the command on my computer (a MBP 16" with sufficient hardware):
cleos push action eosio.token create '[ "alice", "1000000000.0000 SYS"]' -p eosio.token@active

There was a timeout error the first time:

Error 3080006: Transaction took too long
Error Details:
deadline exceeded 1160us
pending console output:

When I ran it the second time, it succeeded with a running time of 984 us. I suggest a note be added about this possible error and what the running time limit is.