docs: Fix typo

fix #300
changelog: ignore

specification/src/instructions.md

@@ -151,7 +151,7 @@ Triton VM cannot know the number of elements that will be absorbed.
 |:--------------|:-------|:----------------|:-----------------------------|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `merkle_step` | 80     | `_ i edcba`     | `_ (i div 2) zyxwv`          | Helps traversing a Merkle tree during authentication path verification. See extended description below.                                                                                                                                                                                                                                                                                           |
 | `xx_dot_step` | 88     | `_ z y x *b *a` | `_ z+p2 y+p1 x+p0 *b+3 *a+3` | Reads two extension field elements from RAM located at the addresses corresponding to the two top stack elements, multiplies the extension field elements, and adds the product `(p0, p1, p2)` to an accumulator located on stack immediately below the two pointers. Also, increase the pointers by the number of words read.                                                                    |
-| `xx_dot_step` | 96     | `_ z y x *b *a` | `_ z+p2 y+p1 x+p0 *b+3 *a+1` | Reads one base field element from RAM located at the addresses corresponding to the top of the stack, one extension field element from RAM located at the address of the second stack element, multiplies the field elements, and adds the product `(p0, p1, p2)` to an accumulator located on stack immediately below the two pointers. Also, increase the pointers by the number of words read. |
+| `xb_dot_step` | 96     | `_ z y x *b *a` | `_ z+p2 y+p1 x+p0 *b+3 *a+1` | Reads one base field element from RAM located at the addresses corresponding to the top of the stack, one extension field element from RAM located at the address of the second stack element, multiplies the field elements, and adds the product `(p0, p1, p2)` to an accumulator located on stack immediately below the two pointers. Also, increase the pointers by the number of words read. |
 
 The instruction `merkle_step` works as follows.
 The 6th element of the stack `i` is taken as the node index for a Merkle tree that is claimed to include data whose digest is the content of stack registers `st4` through `st0`, i.e., `edcba`.