CMake: Do not use versionless targets in examples (Qt Core)

This is confusing, especially because it's not used in the whole snippet.

Pick-to: 5.15
Change-Id: Ibd59646da2c77ac19a38441021c5e99f52015c95
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

src/corelib/doc/snippets/cmake-macros/examples.cmake

@@ -65,10 +65,10 @@ qt5_import_plugins(myapp
 
 #! [qt_import_plugins]
 add_executable(myapp main.cpp)
-target_link_libraries(myapp Qt::Gui Qt::Sql)
+target_link_libraries(myapp Qt5::Gui Qt5::Sql)
 qt_import_plugins(myapp
-    INCLUDE Qt::QCocoaIntegrationPlugin
-    EXCLUDE Qt::QMinimalIntegrationPlugin
+    INCLUDE Qt5::QCocoaIntegrationPlugin
+    EXCLUDE Qt5::QMinimalIntegrationPlugin
     INCLUDE_BY_TYPE imageformats Qt5::QGifPlugin Qt5::QJpegPlugin
     EXCLUDE_BY_TYPE sqldrivers
 )

src/corelib/doc/src/cmake-macros.qdoc

@@ -406,11 +406,11 @@ This command was introduced in Qt 5.15. You can use \l qt5_import_plugins in old
 In the snippet above, the following occurs with the executable \c myapp:
 
 \list
-\li The \c Qt::QCocoaIntegrationPlugin is imported into myapp.
-\li The \c Qt::QMinimalIntegrationPlugin plugin is
+\li The \c Qt5::QCocoaIntegrationPlugin is imported into myapp.
+\li The \c Qt5::QMinimalIntegrationPlugin plugin is
     excluded from being automatically imported into myapp.
 \li The default list of plugins for \c imageformats is
-    overridden to only include Qt::QGifPlugin and Qt::QJpegPlugin.
+    overridden to only include Qt5::QGifPlugin and Qt5::QJpegPlugin.
 \li All \c sqldrivers plugins are excluded from automatic importing.
 \endlist
 */