Updated STORAGE.markdown to reflect minimum log2m.

Author: Timon Karnezos

STORAGE.markdown

@@ -72,7 +72,7 @@ Schema Version
         * the highest 3 bits are used to encode the integer value `registerWidth - 1`, and
         * the remaining 5 bits encode the integer value `log2(numberOfRegisters)`.
 
-    `registerWidth` may take values from 1 to 8, inclusive, and `log2(numberOfRegisters)` may take on 1 to 31, inclusive.
+    `registerWidth` may take values from 1 to 8, inclusive, and `log2(numberOfRegisters)` may take on 4 to 31, inclusive.
 
     For example:
 
@@ -164,4 +164,4 @@ Schema Version
         * if `sparseEnabled = 0` and `explicitCutoff = 63`, then the criteria for promotion is implementation-dependent, as this value of `explicitCutoff` indicates an 'auto' promotion mode. Since `sparseEnabled = 0` the set can only be promoted to a `FULL` set.
         * if `sparseEnabled = 1` and `explicitCutoff = 63`, then the promotion is implementation-dependent, as this value of `explicitCutoff` indicates an 'auto' promotion mode. Since `sparseEnabled = 1` the set can only be promoted to a `SPARSE` set.
 
-    * When inserting an element into a `SPARSE` set, if that element would cause the storage size of the `SPARSE` set to be greater than that of a `FULL` set, then it is promoted to a `FULL` set.
+    * When inserting an element into a `SPARSE` set, if that element would cause the storage size of the `SPARSE` set to be greater than that of a `FULL` set, then it is promoted to a `FULL` set.