DOC: Update HelloWorld guide to use ITK 6 CMake targets

For simplicity we just use ITK_INTERFACE_LIBRARIES.

Author: thewtex

SoftwareGuide/Latex/Introduction/Installation.tex

@@ -647,13 +647,15 @@ \subsection{Hello World!}%
 \begin{minted}[linenos=false]{cmake}
 project(HelloWorld)
 
-set(MINIMUM_ITK_VERSION 5.4)
+set(MINIMUM_ITK_VERSION 6.0)
 find_package(ITK \${MINIMUM_ITK_VERSION} REQUIRED)
-include(${ITK_USE_FILE})
+
+# Generate the ITK factory registration code.
+itk_generate_factory_registration()
 
 add_executable(HelloWorld HelloWorld.cxx)
 
-target_link_libraries(HelloWorld ${ITK_LIBRARIES})
+target_link_libraries(HelloWorld ${ITK_INTERFACE_LIBRARIES})
 \end{minted}
 
 The first line defines the name of your project as it appears in Visual Studio
@@ -663,9 +665,9 @@ \subsection{Hello World!}%
 corrected by providing the location of the directory where ITK was compiled or
 installed on your system. In this case the path to the ITK's binary/installation
 directory needs to be specified as the value of the \code{ITK\_DIR} CMake
-variable. The line \code{include(\$\{USE\_ITK\_FILE\})} loads the
-\code{UseITK.cmake} file which contains the configuration information about the
-specified ITK build. The line starting with \code{add\_executable} call defines
+variable. The line \code{itk\_generate\_factory\_registration()} generates configuration
+to enable input-output factory class registration in the subsequent executable.
+The line starting with \code{add\_executable} call defines
 as its first argument the name of the executable that will be produced
 as result of this project. The remaining argument(s) of \code{add\_executable}
 are the names of the source files to be compiled. Finally, the