Update nf-shobjidl_core-icustomdestinationlist-appendknowncategory.md (#1995)

adding KDC_NONE

Author: ChrisGuzak

sdk-api-src/content/shobjidl_core/nf-shobjidl_core-icustomdestinationlist-appendknowncategory.md

@@ -60,17 +60,17 @@ Type: <b>KNOWNDESTCATEGORY</b>
 
 One of the following values that indicate which known category to add to the list:
 
-
-
 #### KDC_FREQUENT (1)
 
-0x1. Add the <b>Frequent</b> category.
+1 - Add the <b>Frequent</b> category.
 
+#### KDC_RECENT (2)
 
+2 - Add the <b>Recent</b> category.
 
-#### KDC_RECENT (2)
+#### KDC_NONE (-1)
 
-0x2. Add the <b>Recent</b> category.
+-1 - Do not use a category. Note, this value is not represented in KNOWNDESTCATEGORY, use `static_cast<KNOWNDESTCATEGORY>(-1)` to represent this.
 
 ## -returns
 
@@ -116,4 +116,4 @@ The contents of the <b>Frequent</b> and <b>Recent</b> categories are calculated
 
 
 
-<a href="/windows/desktop/shell/taskbar-extensions">Taskbar Extensions</a>
+<a href="/windows/desktop/shell/taskbar-extensions">Taskbar Extensions</a>