Revise doc of NTP64::as_secs_f64()

src/ntp64.rs

@@ -66,10 +66,10 @@ impl NTP64 {
 
     /// Returns this NTP64 as a f64 in seconds.
     ///
-    /// The decimal part of the f64 is the result of a division of NTP64's Fraction part by 2^32.
-    /// As a consequence, the even if resulting f64 seems to have a precision lower than 1 nanosecond,
-    /// that's not the case. It still has the precision of the time source
-    /// (3.5 nanosecond if generated by [`crate::HLC`]).
+    /// The integer part of the f64 is the NTP64's Seconds part.  
+    /// The decimal part of the f64 is the result of a division of NTP64's Fraction part divided by 2^32.  
+    /// Considering the probable large number of Seconds (for a time relative to UNIX_EPOCH), the precision of the resulting f64 might be in the order of microseconds.
+    /// Therefore, it should not be used for comparison. Directly comparing [NTP64] objects is preferable.
     #[inline]
     pub fn as_secs_f64(&self) -> f64 {
         let secs: f64 = self.as_secs() as f64;