Update 02-common-mistakes.md

[laurasootes]

To solve #160 I replaced the html table by a common markdown table, while keeping the contents the same. This fixes the problem that the table was rendered within the next header line

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[josenino95]

Thank you @bencomp and @laurasootes for taking care of this a while ago. I just merged PRs #167 and #171

[bencomp]

Thanks, @josenino95. Could you close #160 too, now that this fixed it?