add tips as comments for send NFT code example

[karthik-durai]

Description of the pull request (what is new / what has changed)

Did you test the changes locally ?

• [X] yes
• [ ] no

Which category (categories) does this pull request belong to?

• [ ] document new feature
• [ ] update documentation that is not relevant anymore
• [X] add examples or more information about a component
• [ ] fix grammar issues
• [ ] other

[andreibancioiu]

In the new version of the SDK-JS & the new cookbook, the arguments are passed in a more explicit manner. E.g.:

https://docs.multiversx.com/sdk-and-tools/sdk-js/sdk-js-cookbook-v13/#single-nft-transfer

I think we can close this PR, but apply karthik-durai's idea in other places - thank you for the contribution :pray: