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Explain that this represents the compiler's default and mustn't be modified by the user. Clarify when it's used as the default. Additionally: * Add a reference to it in cmake-compile-features in text explaining the feature. * Add explanations for the default initialization by `CMAKE_<LANG>_EXTENSIONS_DEFAULT` to all `<LANG>_EXTENSIONS` pages and references to CMP0128. * Slightly reduce the wordiness of the default initialization explanations by removing an unnecessary "it is". Fixes #22828.