Update docs

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -174,6 +174,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a
 - `MEMBERS_PAGING_NUM`: **20**: Number of members that are shown in organization members.
 - `FEED_MAX_COMMIT_NUM`: **5**: Number of maximum commits shown in one activity feed.
 - `FEED_PAGING_NUM`: **20**: Number of items that are displayed in home feed.
+- `SITEMAP_PAGING_NUM`: **20**: Number of items that are displayed in a single subsitemap.
 - `GRAPH_MAX_COMMIT_NUM`: **100**: Number of maximum commits shown in the commit graph.
 - `CODE_COMMENT_LINES`: **4**: Number of line of codes shown for a code comment.
 - `DEFAULT_THEME`: **auto**: \[auto, gitea, arc-green\]: Set the default theme for the Gitea install.