Forgot to add new delete flags to reference table

Author: kovidgoyal

docs/graphics-protocol.rst

@@ -539,9 +539,9 @@ Key      Value                 Default    Description
 **Keys for deleting images**
 -----------------------------------------------------------
 ``d``    Single character.     ``a``      What to delete.
-         ``(a, A, c, C, i,
-         I, p, P, q, Q, x, X,
-         y, Y, z, Z)``.
+         ``(a, A, c, C, n, N,
+         i, I, p, P, q, Q, x,
+         X, y, Y, z, Z)``.
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