Add one Q for matlab-quiz.md (#2269)

Ebazhanov · Sep 23, 2021 · 4f1f8da · 4f1f8da
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 - [ ]
 
 [Reference](https://mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html)
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+#### Q56. You've just plotted some data and want to change the color behind the lines you've plotted to black. Which code block will accomplish this?
+
+- [ ] `h_f = figure;  set(h_f,'Color', [0 0 0]);`
+- [x] `h_a = gca;     set(h_a,'Color', [0 0 0]);`
+- [ ] `h_a = axes;    set(h_a,'Color', [0 0 0]);`
+- [ ] `h_f = gcf;     set(h_a,'Color', [0 0 0]);`