Fix for ClippingPolygon equals function

[javagl]

Description

Until now, this only fixes the JSDoc parameter type for ClippingPolygon#equals from Plane to ClippingPolygon.

See additional comments in the issue.

Issue number and link

#12389

Testing plan

For now, there's not much to test. With main, running npm run build.ts generated

export class ClippingPolygon {
...
    /**
     * Compares the provided ClippingPolygons and returns
    <code>true</code> if they are equal, <code>false</code> otherwise.
     * @param left - The first polygon.
     * @param right - The second polygon.
     * @returns <code>true</code> if left and right are equal, <code>false</code> otherwise.
     */
    static equals(left: Plane, right: Plane): boolean;

and now it generates

export class ClippingPolygon {
...
    /**
     * Compares the provided ClippingPolygons and returns
    <code>true</code> if they are equal, <code>false</code> otherwise.
     * @param left - The first polygon.
     * @param right - The second polygon.
     * @returns <code>true</code> if left and right are equal, <code>false</code> otherwise.
     */
    static equals(left: ClippingPolygon, right: ClippingPolygon): boolean;

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• I have added or updated unit tests to ensure consistent code coverage
• I have updated the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

[github-actions]

Thank you for the pull request, @javagl!

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