Doc: Make "Browsing ISO 7000 Icons" topic creator-only

While this works in Qt Design Studio, it is easier to use a dedicated
Qt Quick Studio component called Iso for this purpose.

Change-Id: I6f2d430ae050b7e0a204077f92ae54987c47f6b7
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

doc/src/qtquick/creator-only/qtquick-iso-icon-browser.qdoc

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2018 The Qt Company Ltd.
+** Copyright (C) 2019 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Creator documentation.
@@ -26,13 +26,8 @@
 /*!
     \contentspage index.html
     \page qtquick-iso-icon-browser.html
-    \if defined(qtdesignstudio)
     \previouspage qmldesigner-pathview-editor.html
     \nextpage creator-quick-ui-forms.html
-    \else
-    \previouspage quick-states.html
-    \nextpage quick-export-to-qml.html
-    \endif
 
     \title Browsing ISO 7000 Icons
 

doc/src/qtquick/qtquick-pathview-editor.qdoc

@@ -28,10 +28,12 @@
     \page qmldesigner-pathview-editor.html
     \if defined(qtdesignstudio)
     \previouspage studio-fonts.html
+    \nextpage creator-quick-ui-forms.html
     \else
     \previouspage quick-states.html
-    \endif
     \nextpage qtquick-iso-icon-browser.html
+    \endif
+
 
     \title Editing PathView Properties
 

doc/src/qtquick/qtquick-ui-forms.qdoc

@@ -33,10 +33,11 @@
 
     \contentspage index.html
     \page creator-quick-ui-forms.html
-    \previouspage qtquick-iso-icon-browser.html
     \if defined(qtdesignstudio)
+    \previouspage qmldesigner-pathview-editor.html
     \nextpage studio-live-preview.html
     \else
+    \previouspage qtquick-iso-icon-browser.html
     \nextpage quick-export-to-qml.html
     \endif