Update Coretime Docs (#5963)

* Update Coretime Docs

Add updated screenshot for parachain registration and include info on fees

* Update docs/learn/learn-guides-coretime-parachains.md

Co-authored-by: bader y <ibnbassem@gmail.com>

* Update docs/learn/learn-guides-coretime-parachains.md

Co-authored-by: bader y <ibnbassem@gmail.com>

* Update docs/learn/learn-guides-coretime-parachains.md

Co-authored-by: bader y <ibnbassem@gmail.com>

---------

Co-authored-by: bader y <ibnbassem@gmail.com>

docs/learn/learn-guides-coretime-parachains.md

@@ -100,13 +100,15 @@ of the usual per-byte method of charging for storing validation and genesis code
 the cost is fixed to the maximum possible code size (`MAX_CODE_SIZE`), regardless of the actual
 size.
 
-On **Kusama**, the deposit required to register a parachain is **~1100 KSM**.
+On **Kusama**, the deposit required to register a parachain is **~1100 KSM** and an estimated fee
+of **~5 KSM**.
 
-On **Polkadot**, the deposit required to register a parachain is **~3300 DOT**.
+On **Polkadot**, the deposit required to register a parachain is **~3300 DOT** and an estimated fee
+of **~150 DOT**.
 
 It is possible to deregister the parachain and withdraw the deposit if the parachain has not
 produced any blocks. If the parachain produced blocks, then the parachain can only be deregistered
-through relay chain governance.
+through the relay chain's governance.
 
 :::
 
@@ -134,12 +136,10 @@ and 116 DOT on Polkadot.
 
 ::: -->
 
-![coretime-register-parathread](../assets/coretime/coretime-register-parathread.png)
+![coretime-register-parathread](../assets/coretime/Register-Parachain.png)
 
 After successful registration, the parachain starts onboarding as a parathread.
 
-![coretime-onboarding-parathread](../assets/coretime/coretime-parachain-onboarding.png)
-
 ## Run Parachain Collator
 
 While the parachain is onboarding, start syncing the [collator](./learn-collator.md) using the