370: Clarify that modifiable flags are bits

Author: achow101

bip-0370.mediawiki

@@ -103,7 +103,7 @@ The new global types for PSBT Version 2 are as follows:
 | None
 | No key data
 | <tt><8-bit uint></tt>
-| An 8 bit unsigned integer as a bitfield for various transaction modification flags. Bit 0 is the Inputs Modifiable Flag and indicates whether inputs can be added or removed. Bit 1 is the Outputs Modifiable Flag and indicates whether outputs can be added or removed. Bit 2 is the Has SIGHASH_SINGLE flag and indicates whether the transaction has a SIGHASH_SINGLE signature who's input and output pairing must be preserved. Bit 2 essentially indicates that the Constructor must iterate the inputs to determine whether and how to add or remove an input.
+| An 8 bit unsigned integer as a bitfield for various transaction modification flags. Bit 0 is the Inputs Modifiable Flag, set to 1 to indicate whether inputs can be added or removed. Bit 1 is the Outputs Modifiable Flag, set to 1 to indicate whether outputs can be added or removed. Bit 2 is the Has SIGHASH_SINGLE flag, set to 1 to indicate whether the transaction has a SIGHASH_SINGLE signature who's input and output pairing must be preserved. Bit 2 essentially indicates that the Constructor must iterate the inputs to determine whether and how to add or remove an input.
 |
 | 0
 | 2
@@ -265,7 +265,7 @@ If it changes the transaction's locktime when there are existing signatures, it
 If the Has SIGHASH_SINGLE flag is True, then the Constructor must iterate through the inputs and find the inputs which have signatures that use SIGHASH_SINGLE.
 The same number of inputs and outputs must be added before those inputs and their corresponding outputs.
 
-A Constructor may choose to declare that no further inputs and outputs can be added to the transaction by setting the booleans in PSBT_GLOBAL_TX_MODIFIABLE to False or by removing this field entirely.
+A Constructor may choose to declare that no further inputs and outputs can be added to the transaction by setting the appropriate bits in PSBT_GLOBAL_TX_MODIFIABLE to 0 or by removing the field entirely.
 
 A single entity is likely to be both a Creator and Constructor.