updated the ISBN description for additonal clarity (#1980)
updated the ISBN description for additonal clarity (#1980)

* updated the ISBN descreption for additonal clarity

* Corrected the example to proper markdown formatting and changed the digits in the first example to 'd'

* Update exercises/isbn-verifier/description.md

Went back to the text block

Co-authored-by: Sascha Mann <46f1a0bd5592a2f9244ca321b129902a06b53e03@mail.saschamann.eu>

* Update exercises/isbn-verifier/description.md

Co-authored-by: Sascha Mann <46f1a0bd5592a2f9244ca321b129902a06b53e03@mail.saschamann.eu>

* Update description.md

* Updated description.md to pass the linter.

Co-authored-by: Sascha Mann <46f1a0bd5592a2f9244ca321b129902a06b53e03@mail.saschamann.eu>
jmluy/x-common,jmluy/x-common,jmluy/x-common