Doc: Describe Preferences > C++ > Code Model > Enable indexing

Task-number: QTCREATORBUG-30604
Change-Id: I93e2e251f58e335c6f4491fd9e7e84e69528611e
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

dist/changelog/changes-14.0.0.md

@@ -66,7 +66,8 @@ Editing
     * Fixed the handling of system headers
       ([QTCREATORBUG-30474](https://bugreports.qt.io/browse/QTCREATORBUG-30474))
 * Built-in
-    * Added the option to disable the built-in indexer
+    * Added the `Enable indexing` option in `Preferences` > `C++` > `Code Model`
+      to turn off the built-in indexer
       ([QTCREATORBUG-29147](https://bugreports.qt.io/browse/QTCREATORBUG-29147))
     * Added an option for "statement macros" that are interpreted by the indenter
       as complete statements that don't require a semicolon at the end

doc/qtcreator/src/editors/creator-only/creator-clang-codemodel.qdoc

@@ -162,7 +162,7 @@
 
     \title Code Model
 
-    \brief Sets global preferences for the code model.
+    \brief Sets global preferences for the C++ code model.
 
     The code model offers services such as code completion, syntactic and
     semantic highlighting, and diagnostics.
@@ -189,6 +189,10 @@
         \li \uicontrol {Use built-in preprocessor to show pre-processed files}
         \li Uses the built-in preprocessor to show the
             pre-processed source file in the editor.
+    \row
+        \li \uicontrol {Enable indexing}
+        \li Turns on the built-in indexer. Clearing this checkbox severely limits
+            the capabilities of the code model.
     \row
         \li \uicontrol {Do not index files greater than}
         \li To avoid out-of-memory crashes caused by indexing huge source files