[Clas12_verystrange] minor changes

[Lei Guo]

I had to change the expected counts for Xi(1820) and Xi(1530) since I  
doubled counted the branching ratio without realizing it was already  
included in the overall efficiency. (beam.tex)

I made some small change to Triggers.tex, caspol.tex, and spinparity.tex

Cheers!

Lei
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