DOCSP-48256 disableJavaScriptJIT deprecation (#11745)

Author: kennethdyer

source/reference/parameters.txt

@@ -1563,32 +1563,9 @@ General Parameters
 
 .. parameter:: disableJavaScriptJIT
 
-   |mongod-only|
-
-   The MongoDB JavaScript engine uses SpiderMonkey, which implements
-   Just-in-Time (JIT) compilation for improved performance when running scripts.
-
-   .. include:: /includes/fact-runtime-startup-parameter
-
-   To enable the JIT, set :parameter:`disableJavaScriptJIT` to ``false``, as in
-   the following example:
-
-   .. code-block:: javascript
-
-      db.adminCommand( { setParameter: 1, disableJavaScriptJIT: false } )
-
-   .. note::
-
-      :query:`$where` will reuse existing JavaScript interpreter
-      contexts, so changes to :parameter:`disableJavaScriptJIT` may not
-      take effect immediately for these operations.
-
-   Alternately, you may enable the JIT at startup time by starting the
-   :binary:`~bin.mongod` instance with the following option:
-
-   .. code-block:: bash
+   .. important::
 
-      mongod --setParameter disableJavaScriptJIT=false
+      Starting in MongoDB 8.0, this parameter has no effect.
 
 .. parameter:: indexBuildMinAvailableDiskSpaceMB