Mark version requirement for basic math tutorial

Author: PProfizi

doc/source/user_guide/tutorials/mathematics/basic_maths.rst

@@ -4,6 +4,10 @@
 Basic maths
 ===========
 
+.. note::
+
+    This tutorial requires DPF 9.1 or above (2025 R1).
+
 .. include:: ../../../links_and_refs.rst
 .. |math operators| replace:: :mod:`math operators <ansys.dpf.core.operators.math>`
 .. |fields_factory| replace:: :mod:`fields_factory<ansys.dpf.core.fields_factory>`

doc/source/user_guide/tutorials/mathematics/index.rst

@@ -19,9 +19,15 @@ PyDPF-Core API and data structures.
        :link: ref_basic_math
        :link-type: ref
        :text-align: center
-
+       :class-card: sd-bg-light
+       :class-header: sd-bg-light sd-text-dark
+       :class-footer: sd-bg-light sd-text-dark
+       
        This tutorial explains how to do some basic
        mathematical operations with PyDPF-Core.
+       
+       +++
+       Requires DPF 9.1 or above (2025 R1).
 
 .. toctree::
     :maxdepth: 2