Fix wording in {checked_}next_power_of_two

Author: Kriskras99

core/src/num/nonzero.rs

@@ -1059,7 +1059,7 @@ macro_rules! nonzero_integer_signedness_dependent_methods {
             unsafe { Self::new_unchecked(self.get().unchecked_add(other)) }
         }
 
-        /// Returns the smallest power of two greater than or equal to n.
+        /// Returns the smallest power of two greater than or equal to `self`.
         /// Checks for overflow and returns [`None`]
         /// if the next power of two is greater than the type’s maximum value.
         /// As a consequence, the result cannot wrap to zero.

core/src/num/uint_macros.rs

@@ -2830,7 +2830,7 @@ macro_rules! uint_impl {
         ///
         /// When return value overflows (i.e., `self > (1 << (N-1))` for type
         /// `uN`), it panics in debug mode and the return value is wrapped to 0 in
-        /// release mode (the only situation in which method can return 0).
+        /// release mode (the only situation in which this method can return 0).
         ///
         /// # Examples
         ///
@@ -2851,7 +2851,7 @@ macro_rules! uint_impl {
             self.one_less_than_next_power_of_two() + 1
         }
 
-        /// Returns the smallest power of two greater than or equal to `n`. If
+        /// Returns the smallest power of two greater than or equal to `self`. If
         /// the next power of two is greater than the type's maximum value,
         /// `None` is returned, otherwise the power of two is wrapped in `Some`.
         ///