Change the actual default delim for merge (it's ";" not ",")

docs/content/tools/merge.rst

@@ -55,7 +55,7 @@ Option                           Description
 
 **-delim**                       | Specify a custom delimiter for the -nms and -scores concat options
                                  | Example: ``-delim "|"``
-                                 | ``Default: ","``
+                                 | ``Default: ";"``
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