docs(arc-89): add arc54 reversible flag

Author: sofinico

ARCs/arc-0089.md

@@ -210,7 +210,7 @@ The Irreversible Flags (`byte`) are defined as follows:
 |:-----:|:------------------------------------------------|:-------:|:---------------------|
 | `LSB` | [ARC-3](./arc-0003.md) Compliant                | `False` | At metadata creation |
 |  `1`  | [ARC-89](./arc-0089.md) Native ASA              | `False` | At metadata creation |
-|  `2`  | Custom, should be reserved for future ARCs      | `False` | Any                  |
+|  `2`  | [ARC-54](./arc-0054.md) Compliant               | `False` | Any                  |
 |  `3`  | Custom, should be reserved for future ARCs      | `False` | Any                  |
 |  `4`  | Custom, should be reserved for future ARCs      | `False` | Any                  |
 |  `5`  | Custom, should be reserved for future ARCs      | `False` | Any                  |
@@ -219,14 +219,17 @@ The Irreversible Flags (`byte`) are defined as follows:
 
 The `MSB` is the leftmost bit in the byte stored in Asset Metadata Box.
 
-The bits `2 ... 6` are reserved for future ARCs (default `False` if not used).
+The bits `3 ... 6` are reserved for future ARCs (default `False` if not used).
 
 The Metadata **MAY** be declared as [ARC-3](./arc-0003.md) compliant on creation
 setting the bit `LSB` in the Irreversible Flags to `True`.
 
 The ASA **MAY** be declared as a _native_ [ARC-89](./arc-0089.md) ASA on creation
 setting the bit `1` in the Irreversible Flags to `True`.
 
+The ASA **MAY** be declared as [ARC-54](./arc-0054.md) compliant at any time
+setting the bit `2` in the Irreversible Flags to `True`.
+
 ###### Metadata Immutability
 
 The Metadata **MAY** be declared as _immutable_ on creation or after, setting the