Revise notes on integer limit macros

Updated notes on integer limit macros and included modern alternatives.

leetcode/lc7/notes.md

@@ -1,9 +1,9 @@
 INT_MAX, INT_MIN are called integer limit macros or more generally type limit constants.(compile-time constants)
-defined in #include <climits>
+defined in #include climits
 
 Modern Alternative:
 
-#include <limits>
+#include limits
 
 numeric_limits<int>::max();
 numeric_limits<int>::min();