Doc: Move sources for "Jump to the Code" to qtdesignstudio\src

To fix QDoc warnings.

Also, hide the topic from the Qt Creator Manual.

Change-Id: I499f338a6f4adc3fff7f6b38eb2363437f1a84d5
Reviewed-by: Johanna Vanhatapio <johanna.vanhatapio@qt.io>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Pranta Ghosh Dastider <pranta.dastider@qt.io>

doc/qtcreator/src/editors/creator-finding.qdoc

@@ -37,6 +37,7 @@
             through projects, files, classes, functions, documentation and
             file systems.
 
+        \if defined(qtdesignstudio)
         \li \l{Jump to the Code}
 
             Jump to the code for a specific component directly from
@@ -44,7 +45,7 @@
             You can also jump to the code of a particular
             \uicontrol {State} or \uicontrol {Connection} from their
             corresponding views.
-
+        \endif
     \endlist
 
 */