Typos in the egs_cbct example

[rtownson]

The egs_cbct example from the documentation (and distributed with the app) seems to have the source and scoring planes incorrectly positioned. https://nrc-cnrc.github.io/EGSnrc/doc/pirs898/egs_cbct.html https://github.com/nrc-cnrc/EGSnrc/blob/master/HEN_HOUSE/user_codes/egs_cbct/example_w5br.egsinp

See the discussion from reddit, which explains the issue: https://www.reddit.com/r/EGSnrc/comments/tgaovx/egs_cbct_documentation/i3cbajb/?context=3