[ARC5] User manual update correction

[Michael Tauson]

> Bleatings and hallucinations,

I seem to be the one hallucinating ... 

> the R-18 through 22/ARC-5.  

That's R-20 through R-22/ARC-5.  Looking at notes
regarding the Type 12 while typing about the ARC-5 is
not a good thing to do.

Sorry 'bout that.

Michael ... who's making much much errors today which
is not good.

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