The open source OpenXR runtime

xrt: Add missing doc comments.

Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/1655>

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src/xrt/include/xrt/xrt_instance.h
··· 176 176 /*! 177 177 * @} 178 178 */ 179 + 180 + /*! 181 + * Instance information structure, including both platform and application info. 182 + */ 179 183 struct xrt_instance_info instance_info; 180 184 185 + /*! 186 + * CLOCK_MONOTONIC timestamp of the instance startup. 187 + */ 181 188 uint64_t startup_timestamp; 182 189 183 190 /*!