Wrong documentation for enable_contract_version

This looks like a copy/paste issue:

Enable a version of a contract from the contract stored at the given hash. **That version of the contract will no longer be callable by call_versioned_contract**. Note that this contract must...

https://github.com/casper-network/casper-node/blob/5b95c0dae66e5dc02e4472f1a3089606d20d2afa/smart_contracts/contract/src/contract_api/storage.rs#L348

FIX by removing the line in bold: "That version of the contract will no longer be callable by call_versioned_contract."

Open smart_contracts/contract/src/contract_api/storage.rs around line 348 and read the enable_contract_version documentation. Remove the sentence stating that the contract version will no longer be callable by call_versioned_contract, then verify that the documentation accurately describes the API; a linked pull request has already addressed this issue.

Written by the indexing model from the issue text.