Assign tracking issue number for feature(nonzero_from_mut)

Author: SOF3

library/core/src/num/nonzero.rs

@@ -84,7 +84,7 @@ macro_rules! nonzero_integers {
                 ///
                 /// # Safety
                 /// The referenced value must not be currently zero.
-                #[unstable(feature = "nonzero_from_mut", issue = "none")]
+                #[unstable(feature = "nonzero_from_mut", issue = "106290")]
                 #[must_use]
                 #[inline]
                 pub unsafe fn from_mut_unchecked(n: &mut $Int) -> &mut Self {
@@ -101,7 +101,7 @@ macro_rules! nonzero_integers {
 
                 /// Converts a primitive mutable reference to a non-zero mutable reference
                 /// if the referenced integer is not zero.
-                #[unstable(feature = "nonzero_from_mut", issue = "none")]
+                #[unstable(feature = "nonzero_from_mut", issue = "106290")]
                 #[must_use]
                 #[inline]
                 pub fn from_mut(n: &mut $Int) -> Option<&mut Self> {