rename - custom to sequencer

Author: gosunuts

README.md

@@ -50,7 +50,7 @@ It support 4 steps to operate OP Stack node
 
 **Q. How can run replica node?**
 - If run Superchain Network, just use env file in /envs.
-- If run your custom node, you should set `rollup.json` and `genesis.json` in `config` directory.
+- If run not Superchain node, you should set `rollup.json` and `genesis.json` in `config` directory.
 
 **Q. When will additional features be supported?**
 - `ALT DA` is enabled. Set `ALT_DA_SERVER` to your alt-da server url.

envs/custom-holesky.env envs/sequencer-holesky.envenvs/custom-holesky.env renamed to envs/sequencer-holesky.env

@@ -20,7 +20,7 @@ if [ "${DOWNLOAD_SNAPSHOT:-}" = "true" ]; then
 fi
 
 if [ ! -z "${L2_SUPERCHAIN_NETWORK:-}" ]; then
-  echo "init only running in custom chain, exiting on [$L2_SUPERCHAIN_NETWORK]..."
+  echo "Exiting on superchain registry chain: [$L2_SUPERCHAIN_NETWORK]..."
   exit 0
 fi