[docs] Explain changes done in reset course page - Blocked by MDL-81872

[sarjona]

This should be integrated when https://tracker.moodle.org/browse/MDL-81872 is merged.

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[aanabit]

Added comments seem OK and explain changes made in MDL-81872

[andrewnicols]

Note: I added an extra commit to:

• tweak wording; and
• fix indentation of the code block

The indentation was necessary to fix the markup and keep the codeblock as a part of the parent LI. Without it being indented it is treated as a separate entity leading to markup resembling:

UL
  LI

CODE

UL
  LI

By indenting the backticks it becomes:

UL
  LI
    CODE
  LI

[sarjona]

Thanks a lot for improving the patch and sharing this useful information Andrew! <3