Update obtain-coretime.md - minor fixes (#434)

* Update obtain-coretime.md - minor fixes

Any account can pay for on-demand block production. Also, specify that the extrinsic needs to be submitted on the relay chain

* Update llms.txt

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Co-authored-by: 0xLucca <[email protected]>

Author: DrW3RK

develop/parachains/deployment/obtain-coretime.md

@@ -73,9 +73,9 @@ For current marketplaces and pricing, consult the [Coretime Marketplaces](https:
 On-demand coretime allows for flexible, as-needed block production. To purchase:
 
 1. Ensure your collator node is fully synchronized with the relay chain
-2. From the account that registered the `ParaID`, submit the `onDemand.placeOrderAllowDeath` extrinsic with:
+2. Submit the `onDemand.placeOrderAllowDeath` extrinsic on the relay chain with:
 
     - **`maxAmountFor`** - sufficient funds for the transaction
     - **`paraId`** - your registered `ParaID`
 
-After succesfully executing the extrinsic, your parachain will produce a block.
+After succesfully executing the extrinsic, your parachain will produce a block.

llms.txt

@@ -4188,7 +4188,7 @@ For current marketplaces and pricing, consult the [Coretime Marketplaces](https:
 On-demand coretime allows for flexible, as-needed block production. To purchase:
 
 1. Ensure your collator node is fully synchronized with the relay chain
-2. From the account that registered the `ParaID`, submit the `onDemand.placeOrderAllowDeath` extrinsic with:
+2. Submit the `onDemand.placeOrderAllowDeath` extrinsic on the relay chain with:
 
     - **`maxAmountFor`** - sufficient funds for the transaction
     - **`paraId`** - your registered `ParaID`