update code comment for buy/sell_on_amm

mention pre-condition that revenue split is not active

runtime-modules/project-token/src/lib.rs

@@ -890,6 +890,7 @@ decl_module! {
  /// - user usable JOY balance must be enough for buying (+ existential deposit)
  /// - slippage tolerance constraints respected if provided
  /// - token total supply and amount value must be s.t. `eval` function doesn't overflow
+ /// - token supply can be modified (there is no active revenue split)
  ///
  /// Postconditions
  /// - `amount` CRT minted into account (which is created if necessary with existential deposit transferred to it)
@@ -977,6 +978,7 @@ decl_module! {
  /// - slippage tolerance constraints respected if provided
  /// - token total supply and amount value must be s.t. `eval` function doesn't overflow
  /// - amm treasury account must have sufficient JOYs for the operation
+ /// - token supply can be modified (there is no active revenue split)
  ///
  /// Postconditions
  /// - `amount` burned from user account