chromeos-config: Fix typo in README

The package names are chromeos-config-bsp-xxxx. Also add indents to make
ordered list auto-number works.

BUG=None
TEST=see the README.md on gerrit

Change-Id: I218f13bf232456aca2803a85cdf2210b8187339c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/1906617
Tested-by: Pi-Hsun Shih <pihsun@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Pi-Hsun Shih <pihsun@chromium.org>
diff --git a/chromeos-config/README.md b/chromeos-config/README.md
index 7a4bbdc..057983e 100644
--- a/chromeos-config/README.md
+++ b/chromeos-config/README.md
@@ -247,23 +247,24 @@
 
 1. Start cros_workon on the ebuild where your source model.yaml lives:
 
-```bash
-(chroot) $ cros_workon start chromeos-base/chrome-config-bsp-{BOARD}
-```
+   ```bash
+   (chroot) $ cros_workon start chromeos-base/chromeos-config-bsp-${BOARD}
+   ```
 
 1. Make and install your incremental changes:
 
-```bash
-(chroot) $ cros_workon_make chromeos-base/chrome-config-bsp-{BOARD} --install
-```
+   ```bash
+   (chroot) $ cros_workon_make chromeos-base/chromeos-config-bsp-${BOARD} --install
+   ```
 
 1. Remerge the chromeos-config ebuild:
 
-Note: The config-bsp overlay path may be slightly different depending on the board and if it is public or private.
+   Note: The config-bsp overlay path may be slightly different depending on the
+   board and if it is public or private.
 
-```bash
-(chroot) $ emerge-$BOARD chromeos-config
-```
+   ```bash
+   (chroot) $ emerge-$BOARD chromeos-config
+   ```
 
 ### Schema Validation