Corrected a syntax error in the dcm2niix solution

the '/dcm' suffix at the end of line 93 leads to all the files being named dcm_whatever instead of 0219191_mystudy-0219-1114_whatever, which then breaks the example code on the subsequent page.

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carpentries-incubator / SDC-BIDS-IntroMRI

Corrected a syntax error in the dcm2niix solution #33