Improve rendering of javadoc content

[kwin]

Render all inline tags in the same way as the standard doclet. Some code simplifications.

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[gnodet]

Good improvement overall — replacing the fragile regex-based Javadoc tag post-processing with a proper SimpleDocTreeVisitor is the right approach. The handling of {@value}, {@systemProperty}, HTML elements, and entities is well done.

Bug — {@code} / {@literal} rendering swapped:

In visitLiteral (line 502), the condition node.getKind() == DocTree.Kind.LITERAL routes {@literal} through renderAsCode() and {@code} through escapeHtml(). Per the Javadoc spec:

• {@code text} (Kind.CODE) should render as <code>text</code>
• {@literal text} (Kind.LITERAL) should render as plain escaped text

The condition should check DocTree.Kind.CODE instead. The sibling visitLink method in the same file demonstrates the correct pattern: LINK_PLAIN → escapeHtml(), LINK → renderAsCode().

The test at line 84 validates the swapped behavior — the expected string shows plain text for {@code} and <code> tags for {@literal}, which matches the buggy code but contradicts the spec.

Suggested fix:

if (node.getKind() == DocTree.Kind.CODE) {
    return renderAsCode(node.getBody().getBody());
} else {
    return escapeHtml(node.getBody().getBody());
}

Minor: renderContent Javadoc has @param tags without descriptions.

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Claude Code on behalf of gnodet