Update 05-counting-mining.md with man date solution

[alex-ball]

Closes #131 by adding man date to the solution for discovering the + option to the date command.

Recreates PRs #216 and #221. Note that MacOS X is now just macOS since the version number has moved on from 10 (X) to 13+. In this instance I have sorted the options/OSes in order of general popularity of OS.

[github-actions]

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The following changes were observed in the rendered markdown documents:

 05-counting-mining.md | 8 ++++----
 md5sum.txt            | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

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⏱️ Updated at 2023-05-09 08:57:50 +0000