Let's drive on the clock documentation!

I wanted a long time ago to comment this clock!

Author: GueLaKais

rclrs/src/clock.rs

@@ -15,6 +15,20 @@ pub enum ClockType {
 }
 
 impl From<ClockType> for rcl_clock_type_t {
+    /// Converts a `ClockType` enum variant into the corresponding `rcl_clock_type_t` value.
+    ///
+    /// This implementation maps each `ClockType` variant to the corresponding `rcl_clock_type_t`
+    /// value defined in the ROS Client Library (RCL) bindings.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use rclrs::clock::ClockType;
+    ///
+    /// let ros_time = ClockType::RosTime;
+    /// let rcl_ros_time: rcl_clock_type_t = ros_time.into();
+    /// assert_eq!(rcl_ros_time, rcl_clock_type_t::RCL_ROS_TIME);
+    /// ```
     fn from(clock_type: ClockType) -> Self {
         match clock_type {
             ClockType::RosTime => rcl_clock_type_t::RCL_ROS_TIME,