Add similar note as LLVM does for minNum and maxNum functions

Author: Urgau

library/core/src/num/f32.rs

@@ -673,6 +673,9 @@ impl f32 {
 
     /// Returns the maximum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for maxNum, except for handling of signaling NaNs.
+    /// This match’s the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0f32;
     /// let y = 2.0f32;
@@ -689,6 +692,9 @@ impl f32 {
 
     /// Returns the minimum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for minNum, except for handling of signaling NaNs.
+    /// This match’s the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0f32;
     /// let y = 2.0f32;

library/core/src/num/f64.rs

@@ -689,6 +689,9 @@ impl f64 {
 
     /// Returns the maximum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for maxNum, except for handling of signaling NaNs.
+    /// This match’s the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0_f64;
     /// let y = 2.0_f64;
@@ -705,6 +708,9 @@ impl f64 {
 
     /// Returns the minimum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for minNum, except for handling of signaling NaNs.
+    /// This match’s the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0_f64;
     /// let y = 2.0_f64;