shiboken6/Documentation: Fix search context of class pages

Write out a (dummy) headline to fix the contexts.

Fixes: PYSIDE-2689
Change-Id: Ia58c682b2cdd2c1d6c25708b3567e2d6632f6e1b
Reviewed-by: Cristian Maureira-Fredes <[email protected]>

Author: FriedemannKleint

sources/shiboken6/generator/qtdoc/qtdocgenerator.cpp

@@ -450,6 +450,8 @@ void QtDocGenerator::generateClass(TextStream &s, const QString &targetDir,
                                    const GeneratorContext &classContext,
                                    QList<GeneratorContext> *contexts)
 {
+    // PYSIDE-2689: Write a (dummy) headline to fix the search contexts.
+    s << headline(classContext.metaClass()->fullName(), '#');
     generateClassRecursion(s, targetDir, classContext, contexts);
 }