Fix comments

Author: ChaiTRex

library/core/tests/num/int_sqrt.rs

@@ -19,14 +19,6 @@ macro_rules! tests {
                 //
                 // For unsigned types check that `isqrt` produces the same
                 // numeric value for `$T` and `NonZero<$T>`.
-                //
-                // Check that the following produce the correct values from
-                // `isqrt` and that `checked_isqrt` produces the same numeric
-                // value as `isqrt`:
-                //
-                // * the first and last 128 nonnegative values
-                // * powers of two, minus one
-                // * powers of two
                 #[test]
                 fn isqrt() {
                     // Check the minimum value because, for signed types,
@@ -194,7 +186,7 @@ macro_rules! signed_check {
                 );
             }
 
-            // `wrapping_neg` so that `$SignedT::MIN` will negate to
+            // `wrapping_neg` so that `<$T>::MIN` will negate to
             // itself rather than panicking.
             let negative_n = n.wrapping_neg();