Updated Optimization (markdown)

Optimization.md

@@ -41,10 +41,10 @@ Another way to change the volume growth strategy is to use `master.toml` generat
 
 ```
 [master.volume_growth]
-count_1 = 7                # create 1 x 7 = 7 actual volumes
-count_2 = 6                # create 2 x 6 = 12 actual volumes
-count_3 = 3                # create 3 x 3 = 9 actual volumes
-count_other = 1            # create n x 1 = n actual volumes
+copy_1 = 7                # create 1 x 7 = 7 actual volumes
+copy_2 = 6                # create 2 x 6 = 12 actual volumes
+copy_3 = 3                # create 3 x 3 = 9 actual volumes
+copy_other = 1            # create n x 1 = n actual volumes
 ```
 
 ## Increase concurrent reads