Each "Using the Shenandoah Garbage Collector" documentation for OpenJDK 8, 17 and 21 is inconsistent with the actual from the point of view of available GC algorithms and default GC algorithm for the major version. These documents should be corrected e.g. like below.

• Red Hat build of OpenJDK > 8 > Using Shenandoah garbage collector with Red Hat build of OpenJDK
  • Chapter 1.
    from

    Concurrent Mark Sweep garbage collector (CMS) and G1, default garbage collector for Red Hat build of OpenJDK 8 perform concurrent marking of live objects.
    

    to

    Concurrent Mark Sweep garbage collector (CMS) and G1 garbage collector perform concurrent marking of live objects.
    

  • Chapter 3.
    from

    This marking mode does the similar work as G1, the default garbage collector for Red Hat build of OpenJDK 8.
    

    to

    This marking mode does the similar work as G1 garbage collector.
    

• Red Hat build of OpenJDK > 17 > Using Shenandoah garbage collector with Red Hat build of OpenJDK 17
  • Chapter 1.
    from

    Concurrent Mark Sweep garbage collector (CMS) and G1, default garbage collector for Red Hat build of OpenJDK 17 perform concurrent marking of live objects.
    

    to

    G1, default garbage collector for Red Hat build of OpenJDK 17 performs concurrent marking of live objects.
    

• Red Hat build of OpenJDK > 21 > Using Shenandoah garbage collector with Red Hat build of OpenJDK 21
  • Chapter 1.
    from

    Concurrent Mark Sweep garbage collector (CMS) and G1, default garbage collector for Red Hat build of OpenJDK 21 perform concurrent marking of live objects.
    

    to

    G1, default garbage collector for Red Hat build of OpenJDK 21 performs concurrent marking of live objects.