Update test.md

docs/user_guide/test.md

@@ -1,15 +1,17 @@
 This is an equation test:
 
 $$
-\label{1}
+\tag{1}
 f(x) = \frac{1}{ax + b} 
 $$
 
 And another equation
 
 $$
-\label{2}
+\tag{2}
 I = \int {dx dy} f(x, y) 
 $$
 
 Now we cite Eqn (1), and here is an inline equation: $a = \cos(\omega t)$. Let's see how it shows
+
+For each ensemble $i$, select$N_{i}$ configurations