Update nf-combaseapi-clsidfromstring.md

returns CO_E_CLASSSTRING if not zero terminated.

Author: DJm00n

sdk-api-src/content/combaseapi/nf-combaseapi-clsidfromstring.md

@@ -61,7 +61,7 @@ Converts a string generated by the <a href="/windows/desktop/api/combaseapi/nf-c
 
 ### -param lpsz [in]
 
-The string representation of the CLSID.
+The zero terminated string representation of the CLSID.
 
 ### -param pclsid [out]