This pull request introduces the following changes to the project with reference to issue ( #122006 ): 1. **Documentation Update**: - Added a new YAML file `if.yaml` under `net` to document network interface functions and macros. - The `if.yaml` file includes the following functions and macros: - Functions: - `if_freenameindex` - `if_indextoname` - `if_nameindex` - `if_nametoindex` - Macros: - `IF_NAMESIZE` 2. **CMake Configuration Update**: - Updated the `CMakeLists.txt` file to create the necessary directory for the `net` headers. - Included the `net/if` documentation in the Sphinx build configuration. 3. **Index Update**: - Updated the `index.rst` file to include a reference to the newly added `net/if` documentation. **Purpose**: - This pull request adds documentation for network interface functions and macros, ensuring they are included in the project's documentation. - Updates the CMake configuration to support the new documentation. **Testing**: - Verified that the new YAML file is correctly referenced in the `index.rst`. - Ensured that the documentation builds without errors and includes the new network interface documentation. Co-authored-by: Nick Desaulniers <ndesaulniers@google.com>
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