Reflect renaming of QtQmlComponent to QtQuickViewContent in other docs

Why

As a result of QTBUG-126976, QtQmlComponent has been renamed to QtQuickViewContent.

The QtQuickView.loadComponent() has also been renamed to QtQuickView.loadContent().
Documentation changes inside the class, and also in QtQuickView has already been applied.

What

It's possible that there are more places in the documentation of the feature, where "component" or "QML component" is being used that refers to QtQuickViewContent:

Docs inside other source code, docs outside of java/c++ source code, and example documentation.

How

Review all documents related this feature, potentially by using a regex search, to find the places that the word "QML component" or "component" should be replaced by "QML content" or "content".