docs: fix several typos in the document (backport #22052)

[mergify]

Description

I've found several typos in this document while reviewing it.
The typos are fixed now.

Author Checklist

• confirmed ! in the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• reviewed "Files changed" and left comments if necessary
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• updated the relevant documentation or specification, including comments for documenting Go code
• confirmed all CI checks have passed

Summary by CodeRabbit

• Documentation
  • Improved grammatical accuracy and clarity in the NFT module documentation.

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This is an automatic backport of pull request #22052 done by [Mergify](https://mergify.com).

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