Tabs example typo correction

[Steveorevo]

Following the tabs example, typo corrected; otherwise "undefined variable 'tab' error"

[codecov]

Codecov Report

Merging #686 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #686   +/-   ##
==========================================
  Coverage      72.78%   72.78%           
  Complexity      1921     1921           
==========================================
  Files            105      105           
  Lines           4530     4530           
==========================================
  Hits            3297     3297           
  Misses          1233     1233

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[DarkSide666]

oh. Thank you!