Minor error on bash `sed` command on run-local-rollup-and-sequencer#configure-and-start-the-local-astria-sequencer

[sed](https://github.com/astriaorg/docs/blob/7362e04a378ad6a7239d1a669b1b176f206fa215/docs/tutorials/run-local-rollup-and-sequencer.md?plain=1#L106) command has an extra `''` parameter.

Suggestion:

```bash
export NEW_NAME="my-new-chain"
sed -i '/\[networks\.local\]/,/^$/{ s/rollup_name = .*/rollup_name = '\'''$NEW_NAME''\''/; }' ~/.astria/default/networks-config.toml
```
