Small grammar fix

docs/fs.md

@@ -26,4 +26,4 @@
 ```
 - **title:** title of the FOD project, may be optionally shown on players
 - **icon:** the filename of 256x256 PNG file in the "META" folder that will be used as icon, may be optionally shown on players
-- **start:** the starting point of the FOD, it's characterized by the type of start point ("MENU" or "VIDEO") and it's ID
+- **start:** the starting point of the FOD, it's characterized by the type of start point ("MENU" or "VIDEO") and its ID