Simplify comments to be more concise and student-like

- Removed verbose explanations
- Made comments shorter and more casual
- Focus on key concepts rather than formal descriptions

01/And.hdl

@@ -11,7 +11,7 @@ CHIP And {
     OUT out;
 
     PARTS:
-    // And(a,b) = Not(Nand(a,b))
+    // And = Not(Nand)
     Nand(a=a, b=b, out=tmp);
     Not(in=tmp, out=out);
 }