Merge pull request #4463 from EddieBreeveld/patch-3

Update wctomb-s-wctomb-s-l.md

Author: Jak-MS

docs/c-runtime-library/reference/wctomb-s-wctomb-s-l.md

@@ -44,7 +44,7 @@ The address of a multibyte character.
 Size of the buffer *`mbchar`*.
 
 *`wchar`*\
-A wide character.
+The wide character to convert.
 
 *`locale`*\
 The locale to use.
@@ -60,9 +60,11 @@ Error Conditions
 | `NULL` | >0 | `EINVAL` | not modified |
 | any | >`INT_MAX` | `EINVAL` | not modified |
 | any | too small | `EINVAL` | not modified |
-
+ 
 If any of the above error conditions occurs, the invalid parameter handler is invoked, as described in [Parameter validation](../parameter-validation.md). If execution is allowed to continue, `wctomb` returns `EINVAL` and sets `errno` to `EINVAL`.
 
+The return value [`EILSEQ`](../errno-constants.md) indicates that the value passed via the parameter `wchar` is not a valid wide character.
+
 ## Remarks
 
 The **`wctomb_s`** function converts its *`wchar`* argument to the corresponding multibyte character and stores the result at *`mbchar`*. You can call the function from any point in any program.