contracts: Allow indeterministic instructions off-chain (#12469)

* Allow indetermistic instructions off-chain

* Apply suggestions from code review

Co-authored-by: Sasha Gryaznov <hi@agryaznov.com>

* fmt

Co-authored-by: Sasha Gryaznov <hi@agryaznov.com>

substrate/frame/contracts/src/wasm/runtime.rs

@@ -2384,6 +2384,7 @@ pub mod env {
 	/// 2. Contracts using this API can't be assumed as having deterministic addresses. Said another
 	/// way, when using this API you lose the guarantee that an address always identifies a specific
 	/// code hash.
+	///
 	/// 3. If a contract calls into itself after changing its code the new call would use
 	/// the new code. However, if the original caller panics after returning from the sub call it
 	/// would revert the changes made by `seal_set_code_hash` and the next caller would use