ipynb: tutorial: Correct pathes for TrappyUsage tutorial
ipynb: tutorial: Correct pathes for TrappyUsage tutorial

Fix the path for the trace files, remove a spurious (and broken) cell and
correct a couple of other minor errors.

Signed-off-by: Daniel Thompson <4421c302a8f2019ff02452a16ddbdd37770f814c@linaro.org>

credp/lisa,credp/lisa,bjackman/lisa,credp/lisa,credp/lisa,ARM-software/lisa,JaviMerino/lisa,mdigiorgio/lisa,joelagnel/lisa,joelagnel/lisa,ARM-software/lisa,ARM-software/lisa,mdigiorgio/lisa,arnoldlu/lisa,arnoldlu/lisa,ARM-software/lisa,bjackman/lisa