docs: modify the corresponding link in the code document (backport #22151)

[mergify]

Description

The original code has been updated, but the corresponding line count for this link has not been updated.
This PR changes it to the correct corresponding numbers of rows.

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title, you can find examples of the prefixes below:

• 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

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I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage

Summary by CodeRabbit

• Documentation
  • Updated the README to provide a comprehensive overview of the fee grant module, including expanded sections on concepts, state management, messages, events, and client interactions.
  • Added detailed instructions for using CLI and gRPC to interact with the fee grant module, enhancing usability for developers and users.
  • Introduced a structured contents section for easier navigation through the document.

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This is an automatic backport of pull request #22151 done by [Mergify](https://mergify.com).

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