fix(docs): correct code block indentation in core_compatibility.rst

[eMUQI]

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Description of Change

This Pull Request fixes indentation issues in the core_compatibility.rst documentation file, specifically within .. code-block:: cpp sections. These formatting issues previously caused the code blocks to be rendered incorrectly in the generated documentation.

No functionality or logic is changed — this is a documentation-only fix.

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[pedrominatel]

Hi @eMUQI, please check the issue:

en/generic: /home/runner/work/arduino-esp32/arduino-esp32/docs/en/guides/core_compatibility.rst:18: ERROR: Unexpected indentation.

[eMUQI]

Hi @eMUQI, please check the issue:

en/generic: /home/runner/work/arduino-esp32/arduino-esp32/docs/en/guides/core_compatibility.rst:18: ERROR: Unexpected indentation.

I just tested it locally and encountered the same issue:

Honestly, I'm not sure how to resolve this error because I don't think there is one.

I copied the same code block below, sphinx didn't report an error and displayed it normally.

This confuses me. I'm unsure if it's an ESP Docs or a sphinx error. I'll test it in a pure sphinx environment when I have time.

[pedrominatel]

Please try this:

.. code-block:: cpp

    #ifdef ESP_ARDUINO_VERSION_MAJOR
    #if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 0)
        // Code for version 3.x
    #else
        // Code for version 2.x
    #endif
    #else
        // Code for version 1.x
    #endif