[chore]: update Burn<Trigger, u32> warning (hyperledger-iroha#409)

* [chore]: update `Burn<Trigger, u32>` warning

- Change `tip` to `warning`
- Align the warning with the list item about `Burn`, not the whole list

Signed-off-by: 0x009922 <a.marcius26@gmail.com>

* Update src/guide/blockchain/triggers.md

Co-authored-by: William Richter <88400283+WRRicht3r@users.noreply.github.com>
Signed-off-by: 0x009922 <a.marcius26@gmail.com>

---------

Signed-off-by: 0x009922 <a.marcius26@gmail.com>
Co-authored-by: William Richter <88400283+WRRicht3r@users.noreply.github.com>

src/guide/blockchain/triggers.md

@@ -555,13 +555,13 @@ All Iroha Special Instructions work with triggers, specifically:
 - `Burn<Trigger, u32>`: For triggers that repeat a certain number of times,
   decrease the number of times that the trigger gets executed.
 
-::: tip
+  ::: warning
 
-If the number provided is greater than the remaining number of repetitions,
-the instruction fails to execute, and the transaction that it is part of is
-rejected.
+  If the number provided is greater than the remaining number of repetitions,
+  the instruction will fail to execute, and the transaction that it is part of will be
+  rejected.
 
-:::
+  :::
 
 You can learn more about Iroha Special Instructions in the
 [dedicated section](instructions.md).