fix: modify docs Next Page link

[DongjaJ]

Description

[ What changed? Feel free to be brief. ]

When I was on the "getting-started/install", I found the next page link at the bottom was "getting-started/install".

The same phenomenon occurred in "chat/how-to-use-it", "autocomplete/how-to-use-it", "edit/how-to-use-it", and "actions/how-to-use-it".

It has been modified appropriately.

Checklist

• [x] The base branch of this PR is dev, rather than main
• [x] The relevant docs, if any, have been updated or created

Screenshots

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as-is

to-be

Testing

[ For new or modified features, provide step-by-step testing instructions to validate the intended behavior of the change. ]