Typo in egs_chamber exapmle2

[wkt84]

The input file of egs_chamber example seems to have tiny typos.

EGSnrc/HEN_HOUSE/user_codes/egs_chamber/example2_chamber_dd.egsinp

Line 302 in a6fc389

# A 30x30 cm^2 rectilinear region of air, infinite along the

x-planes = -30  30
y-planes = -30 30

This means 60x60cm^2, not 30x30 cm^2, right?
The same is true for the water region.

I'll send out a PR if you're willing to revise it.

[rtownson]

Thanks for noticing this, I'll fix it, I was planning to go through these examples anyway.