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>
