fix: add more meaningful placeholder to minting process

[kkukelka]

Thank you for your contribution to the KodaDot NFT gallery.
👇 _ Do a quick check before the merge.

PR type

• Bugfix
• Feature
• Refactoring

What's new?

• PR closes Add placeholder to airdrop at simple mint #2016
• placeholder now includes meaningful example for mass airdrops

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• My contribution builds clean without any errors or warnings
• I've merged recent default branch -- main and I've no conflicts
• I've tried respect high code quality standards
• I've didn't break any original functionality
• I've posted screenshot of demonstrated change in this PR

Optional

• I've tested it at </rmrk/collection/26902bc2f7c20c546a-1FVG7>
• I've tested PR on mobile and everything seems works
• I found edge cases

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Screenshot

• My fix has changed something on UI, a screenshot is best to understand changes for others.

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[kkukelka]

In case you wonder, yes this is the correct syntax to make multiline textarea placeholders in Vue ! 🥦

[yangwao]

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