Update band-struc.md

Author: 1041176461

docs/examples/band-struc.md

@@ -85,6 +85,8 @@ The rest of the files arranged in sections, each section with a header such as b
 ...
 </data>
 
+```
+
 The shape of text contents of element <data> is (Number of k-points, Number of bands) 
 
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