docs(migration): add note about MINIMAL_BUILD to 5.5 migration guide

Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>

docs/en/migration-guides/release-5.x/5.5/build-system.rst

@@ -0,0 +1,9 @@
+Build System
+============
+
+:link_to_translation:`zh_CN:[中文]`
+
+Examples built with the MINIMAL_BUILD build property enabled
+------------------------------------------------------------
+
+Most of the examples in ESP-IDF are now being built with the ``MINIMAL_BUILD`` property enabled in their project ``CMakeLists.txt`` by using ``idf_build_set_property(MINIMAL_BUILD ON)``. This change has reduced the build time for the examples because only the ``main`` component and its transitive dependencies are included in the build. As a side effect, only the configuration for these components will be available in menuconfig, which is also noted in the ``Components config`` menu. With ``MINIMAL_BUILD`` enabled, a component needs to be added to the build as a ``main`` component dependency or as its transitive dependency to become visible in menuconfig and be compiled. For more information, please see :ref:`Including Components in the Build <including-components-in-the-build>`

docs/en/migration-guides/release-5.x/5.5/index.rst

@@ -6,6 +6,7 @@ Migration from 5.4 to 5.5
 .. toctree::
     :maxdepth: 1
 
+    build-system
     security
     system
     peripherals