[README.md] Fix blockquote in README.md
Blockquote in README.md misses a ` character. This commit fixes it.
@@ -125,7 +125,7 @@ To check all pre-defined configurations, type as follows:
##### 1.1 Additional Configuration (optional)
After basic configuration by [1. Configuration](#1-configuration), you can additionally modify your configuration with *menuconfig*.
-``bash
+```bash
./dbuild.sh menuconfig
```
> **Note**
