message: capi: Don't state that has_value is invalid when trapped is true
diff: @@ -32,10 +32,11 @@ typedef struct FizzyExecutionResult
  {
  /// Whether execution ended with a trap.
  bool trapped;
  - /// Whether function returned a value. Valid only if trapped equals false.
  + /// Whether function returned a value.
  + /// Equals false if trapped equals true.
  bool has_value;
  /// Value returned from a function.
  - /// Valid only if trapped equals false and has_value equals true.
  + /// Valid only if has_value equals true.
  FizzyValue value;
  } FizzyExecutionResult;
  