Minor edits after my DPC++ lab yesterday

[plvlnisse]

Summary

Clarifications to the lab exercises on essential OneAPI/DPC++

URLs

a/DirectProgramming/DPC++/Jupyter/oneapi-essentials-training/03_DPCPP_Unified_Shared_Memory/Unified_Shared_Memory.ipynb
a/DirectProgramming/DPC++/Jupyter/oneapi-essentials-training/04_DPCPP_Sub_Groups/Sub_Groups.ipynb
a/DirectProgramming/DPC++/Jupyter/oneapi-essentials-training/04_DPCPP_Sub_Groups/lab/sub_group_lab.cpp

Additional details

These are merely some rewording to see if this is a way to provide feedback. There might be some more as I go along
oneapi-essentials-training.patches.txt

[hexu33]

OneSmpl_Team1 working on this

[hexu33]

(OneSmpl_Team1)

@plvlnisse

This issue will not occur in the latest version. This issue can be closed now.