Remove inaccessible Javadoc links from Clipper64

[Copilot]

The reported Javadoc warnings came from Clipper64 linking to inherited methods declared on package-private ClipperBase. Javadoc treated those member references as inaccessible and emitted repeated warnings during doc generation.

• Javadoc cleanup

  • Replaced {@link ...} references to inherited path-loading methods in Clipper64 with inline code references.
  • Preserved the API guidance while avoiding links that traverse a non-public superclass.

• Scope

  • Limited to the Clipper64 class-level execution documentation.
  • No behavioral or API changes.

// before
{@link #addSubject(Paths64) addSubject()},
{@link #addOpenSubject(Paths64) addOpenSubject()}
and {@link #addClip(Paths64) addClip()}

// after
<code>addSubject()</code>, <code>addOpenSubject()</code>
and <code>addClip()</code>

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