doc/format-analysis.org: features go from "start" to "stop"

There was an inconsistency in the specification: "stop" was used several times, and "end" once.

doc/format-analysis.org

@@ -119,8 +119,8 @@ do a correct gathering.
                 "top": 1,
                 "seg":
                 {
-		    "5": {"name": "TRGV5*01",  "start": 1,   "end": 86},
-		    "3": {"name": "TRGJ1*02",  "start": 89,  "end": 118}
+		    "5": {"name": "TRGV5*01",  "start": 1,   "stop": 86},
+		    "3": {"name": "TRGJ1*02",  "start": 89,  "stop": 118}
 		}
             },
             {