Fixes grammar.

kelvinlauKL · web-flow · commit 8ea6fb23654c · 2017-10-07T22:40:10.000-07:00
diff --git a/Big-O Notation.markdown b/Big-O Notation.markdown
@@ -28,7 +28,7 @@ Some examples to better understand the Big(O) notation:
   let value = array[5]
   ```
     
-  Another example of O(1) is Pushing and Popping from Stack.
+  Another example of O(1) is pushing and popping from Stack.
   
  
 **O(log n)**
