Use Raymonds wording for the doc

Author: sobolevn

Doc/library/types.rst

@@ -390,12 +390,18 @@ Standard names are defined for the following types:
    signifying (respectively) the types of the underlying mapping's keys and
    values.
 
-   .. warning::
+   .. note::
 
-      ``MappingProxyType`` can expose its internal mapping
-      in some rare cases on some versions of Python.
-      Starting from Python 3.15 it is recommeneded
-      to use truly immutable :class:`frozendict` instead.
+      There are important differences between ``MappingProxyType``
+      and :class:`frozendict`.
+
+      ``MappingProxyType`` is a wrapper around a mapping that renders
+      the mapping immutable to the viewer of the proxy
+      without affecting the underlying container.
+      ``MappingProxyType`` can expose its internal mapping in some rare cases.
+
+      While ``frozendict`` is a concrete container type
+      that actually holds data that cannot be changed in any way.
 
    .. versionadded:: 3.3