SVG change for hitpass

[Dridi Boukelmoune]

Hi,

Here is a partial diff of the change I'm ready to push if the result
is OK for everyone:

-label="[...]{deliver|{<fetch_304>304?|<non_304>other?}}}}"
+label="[...]{deliver or pass|{<fetch_304>304?|<non_304>other?}}}}"

Please find the resulting SVG attached. It doesn't follow the usual
pattern but I don't think having two boxes with "304?/other?" sub
boxes (or whatever it is called) would bring value.

And there's still return(fail) to sneak in the diagrams.

Thoughts?

Dridi
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