Update styles.md

drom · Dec 14, 2015 · 760743e · 760743e
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 ## DIN
 
- * [DIN 40700](https://commons.wikimedia.org/wiki/Category:DIN_40700)
+  * DIN 40700
+    * [logic symbols](https://commons.wikimedia.org/wiki/Category:DIN_40700)
+    * [circuit symbols](https://commons.wikimedia.org/wiki/Category:DIN_circuit_symbols)
 
 ## ГОСТ (GOST)