Missing semi-colon in 'interest-is-interesting' tutorial added

[shankarlohar]

fixes #732

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[vaeng]

You need to fix this in 3 places:

• https://github.com/exercism/cpp/blob/a7653bb265dd3a8a740ca11e591eca3df13b76c3/concepts/loops/about.md#L60
• https://github.com/exercism/cpp/blob/a7653bb265dd3a8a740ca11e591eca3df13b76c3/concepts/loops/introduction.md#L60
• https://github.com/exercism/cpp/blob/a7653bb265dd3a8a740ca11e591eca3df13b76c3/exercises/concept/interest-is-interesting/.docs/introduction.md#L60

[shankarlohar]

okay

[shankarlohar]

Done! @vaeng

[vaeng]

I did a merge and pushed to retrigger the actions, somehow they got lost and did not report back, so your PR could not be merged