Update note

Author: febo

p-token/src/processor/close_account.rs

@@ -50,7 +50,9 @@ pub fn process_close_account(accounts: &[AccountInfo]) -> ProgramResult {
     unsafe {
         // Moves the lamports to the destination account.
         //
-        // Note: The total lamports supply is bound to `u64::MAX`.
+        // Note: This is safe since the runtime checks for balanced instructions
+        // before and after each CPI and instruction, and the total lamports
+        // supply is bound to `u64::MAX`.
         *destination_account_info.borrow_mut_lamports_unchecked() += source_account_info.lamports();
         // Closes the source account.
         source_account_info.close_unchecked();