api sdk_version (conan-io#3751)

Author: memsharded

reference/config_files/profiles.rst

@@ -680,6 +680,7 @@ the associated runtime, you can use:
     - **`detect_clang_compiler(compiler_exe="clang")`**: Return the tuple ('clang'|'apple-clang', version, executable) for ``clang`` or ``apple-clang``.
     - **`detect_msvc_compiler()`**: Detect the compiler ('msvc', version, None) default version of the latest VS IDE installed
     - **`detect_cl_compiler(compiler_exe="cl")`**: Detect the compiler ('msvc', version, executable) for the ``cl.exe`` compiler
+    - **`detect_sdk_version(sdk)`**: Detect the Apple SDK version (``None`` for non Apple platforms), for the given ``sdk``. Equivalent to ``xcrun -sdk {sdk} --show-sdk-version``
 
 
 .. _reference_config_files_profile_patterns: