Update memchr-wmemchr.md

- Fix some formatting and a typo unrelated to the previous fix.
- Update date field.

Author: Colin Robertson

docs/c-runtime-library/reference/memchr-wmemchr.md

@@ -1,6 +1,6 @@
 ---
 title: "memchr, wmemchr"
-ms.date: "11/04/2016"
+ms.date: "03/31/2019"
 apiname: ["wmemchr", "memchr"]
 apilocation: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll", "ntoskrnl.exe"]
 apitype: "DLLExport"
@@ -66,7 +66,7 @@ If successful, returns a pointer to the first location of *c* in *buffer*. Other
 
 `memchr` and `wmemchr` look for the first occurrence of *c* in the first *count* characters of *buffer*. It stops when it finds *c* or when it has checked the first *count* characters.
 
-In C, these functions take a **const** pointer for the first argument. In C++, two overloads are available. The overload taking a pointer to **const** returns a pointer to **const**; the version that takes a pointer to non-**const** returns a pointer to non-**const**. The macro _CRT_CONST_CORRECT_OVERLOADS is defined if both the **const** and non-**const** versions of these functions are available. If you require the non-**const** behavior for both C++ overloadsin C++, define the symbol _CONST_RETURN.
+In C, these functions take a **const** pointer for the first argument. In C++, two overloads are available. The overload taking a pointer to **const** returns a pointer to **const**; the version that takes a pointer to non-**const** returns a pointer to non-**const**. The macro \_CRT\_CONST\_CORRECT\_OVERLOADS is defined if both the **const** and non-**const** versions of these functions are available. If you require the non-**const** behavior for both C++ overloads in C++, define the symbol \_CONST\_RETURN.
 
 ## Requirements