add comment explaining execution_resources name is for legacy

[ShahakShama]

This change is 

[ArielElp]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @ShahakShama)

---

api/starknet_trace_api_openrpc.json line 379 at r1 (raw file):

                            "execution_resources": {
                                "title": "Computation resources",
                                "description": "Resources consumed by the internal call. This is named execution_resources for legacy",

for legacy reasons

[ArielElp]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ShahakShama)