docs(useMousePressed): fix JSDoc error message

[wjp980108]

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As the VueUse audience continues to grow, we have been inundated with an overwhelming number of feature requests and pull requests. As a result, maintaining the project has become increasingly challenging and has stretched our capacity to its limits. As such, in the near future, we may need to slow down our acceptance of new features and prioritize the stability and quality of existing functions. Please note that new features for VueUse may not be accepted at this time. If you have any new ideas, we suggest that you first incorporate them into your own codebase, iterate on them to suit your needs, and assess their generalizability. If you strongly believe that your ideas are beneficial to the community, you may submit a pull request along with your use cases, and we would be happy to review and discuss them. Thank you for your understanding.

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Description

fix(useMousePressed) method JSDoc error message，Change Reactive mouse position to Reactive Mouse Pressing State.

Additional context

[wjp980108]

Would it be better to change the words outside the first word of the sentence to lowercase?

Thank you for pointing out this error, and I will correct this immediately and ensure greater attention in the future