Fix typo regarding stdckdint header

Author: tomice

_posts/2026-04-05-exploring-c++26.md

@@ -452,9 +452,9 @@ If a path is never exercised, then a contract violation on that path will never
 be observed. Still, this is a step in the right direction as C++ continues to
 moves towards stronger correctness and safety expectations.
 
-## `<stdchkint.h>`
+## `<stdckdint.h>`
 
-C++26 adds `<stdchkint.h>` which includes checked integer arithmetic functions
+C++26 adds `<stdckdint.h>` which includes checked integer arithmetic functions
 like `ckd_add`, `ckd_sub`, and `ckd_mul`. These perform integer arithmetic and
 report whether the result can be represented in the destination type. These are
 perfect for areas where overflow bugs show up like computing buffer offsets,
@@ -465,7 +465,7 @@ compiler-specific builtins trying to do the same thing.
 ### Compute total size of a packet
 
 ```cpp
-#include <stdchkint.h>
+#include <stdckdint.h>
 #include <cstddef>
 
 // Compute the total size of a packet made up of a header,