minor #18341 Update parameter to compile-time prefix (yesdevnull)

This PR was merged into the 6.3 branch.

Discussion
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Update parameter to compile-time prefix

Use the new compile-time only prefix for build parameters.

See symfony/symfony#47680 for the original feature implementation.

Commits
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cf36166 [Performance] Update parameter to compile-time prefix

Author: javiereguiluz

performance.rst

@@ -60,7 +60,7 @@ container into a single file, which could improve performance when using
         # config/services.yaml
         parameters:
             # ...
-            container.dumper.inline_factories: true
+            .container.dumper.inline_factories: true
 
     .. code-block:: xml
 
@@ -72,7 +72,7 @@ container into a single file, which could improve performance when using
 
             <parameters>
                 <!-- ... -->
-                <parameter key="container.dumper.inline_factories">true</parameter>
+                <parameter key=".container.dumper.inline_factories">true</parameter>
             </parameters>
         </container>
 
@@ -81,10 +81,15 @@ container into a single file, which could improve performance when using
         // config/services.php
 
         // ...
-        $container->parameters()->set('container.dumper.inline_factories', true);
+        $container->parameters()->set('.container.dumper.inline_factories', true);
 
 .. _performance-use-opcache:
 
+.. tip::
+
+    The ``.`` prefix denotes a parameter that is only used during compilation of the container.
+    See :ref:`Configuration Parameters <configuration-parameters>` for more details.
+
 Use the OPcache Byte Code Cache
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~