Fix documentation for log functions int

Author: alex-semenyuk

library/core/src/num/int_macros.rs

@@ -2189,7 +2189,7 @@ macro_rules! int_impl {
         ///
         /// # Panics
         ///
-        /// When the number is zero, or if the base is not at least 2; it
+        /// When the number is negative, zero, or if the base is not at least 2; it
         /// panics in debug mode and the return value is 0 in release
         /// mode.
         ///
@@ -2223,7 +2223,7 @@ macro_rules! int_impl {
         ///
         /// # Panics
         ///
-        /// When the number is zero it panics in debug mode and the return value
+        /// When the number is negative or zero it panics in debug mode and the return value
         /// is 0 in release mode.
         ///
         /// # Examples
@@ -2256,7 +2256,7 @@ macro_rules! int_impl {
         ///
         /// # Panics
         ///
-        /// When the number is zero it panics in debug mode and the return value
+        /// When the number is negative or zero it panics in debug mode and the return value
         /// is 0 in release mode.
         ///
         /// # Example