docs: fix useLinkClickHandler defaultShouldRevalidate default description

[dfedoryshchev]

The useLinkClickHandler JSDoc documents defaultShouldRevalidate as "Defaults to true", but the hook applies no default: when the option is omitted it is passed through as undefined and the router falls back to its standard revalidation behavior, which is not unconditional revalidation.

Updated the @param description to describe the actual default behavior.

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