Doc: Update info about resetting the QML code model

- Add the case where you cannot see your new QML module.
- Remove obsolete use case and message.

Task-number: QTCREATORBUG-29826
Change-Id: I29c2852d32007c64e343bcbe30a1d218f9ff89d3
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

doc/qtcreator/src/editors/creator-code-syntax.qdoc

@@ -747,24 +747,21 @@
 
     \section1 Resetting the Code Model
 
-    If you change the build and run kit when you have QML files open in the code
-    editor, the code model might become corrupt. The following error message
-    indicates that this might have happened: \e{Using Qt Quick 1 code model
-    instead of Qt Quick 2}.
+    If you see the following error messages after you add a new QML module,
+    try building the project and then resetting the code model:
 
-    To see the error message, move the mouse pointer over code that
+    \list
+        \li QML module not found.
+        \li Unknown Component (M300).
+    \endlist
+
+    To see an error message, move the mouse pointer over code that
     \QC underlines in the code editor or when you open a QML file in \QDS.
 
     To reset the code model, select \uicontrol Tools > \uicontrol {QML/JS} >
     \uicontrol {Reset Code Model}.
 
-    \if defined(qtcreator)
-    If this does not help, try changing the QML emulation layer to the one that
-    was built with the same Qt version as the one selected in the build and run
-    kit.
-    \endif
-
-    \sa {Check code syntax}
+    \sa {Check code syntax}, {Using QML Modules with Plugins}
 */
 
 /*!

doc/qtcreator/src/qtquick/qtquick-modules-with-plugins.qdoc

@@ -67,6 +67,11 @@
         \li Import the module into the project, as instructed in
             \l {Importing QML Modules}.
         \endlist
+
+        \note If \QC cannot find the new QML module, build the project
+        and then go to \uicontrol {Tools} > \uicontrol {QML/JS} >
+        \uicontrol {Reset Code Model} to reset the code model.
+
         \else
         \li Build your module using the same Qt version and compiler as \QDS.
             For more information, see \l {Running QML Modules in Design Mode}.
@@ -143,4 +148,6 @@
     used only in the \uicontrol Design mode.
     For an example, see \l {Qt Quick Controls - Contact List}.
     \endif
+
+    \sa {Resetting the Code Model}
 */