[DOCS] adjust LTS disclaimer (#29162)

Author: kblaszczak-intel

docs/articles_en/get-started/install-openvino.rst

@@ -28,7 +28,8 @@ OpenVINO 2025.0, described here, is not a Long-Term-Support version!
 All currently supported versions are:
 
 * 2025.0 (development)
-* 2023.3 (LTS)
+* 2024.6 (maintenance)
+* 2023.3 (LTS), it will be deprecated at the end of 2025.
 
 
 .. dropdown:: Effortless GenAI integration with OpenVINO GenAI