message: docs: fixing syntax
  line 3: Following steps -> The following steps
  line 5: creates -> create
  line 12: this same directory -> the same directory
diff: # Quick Start
  -Following steps will assume that the shell can find the executable `ckb`.
  +The following steps will assume that the shell can find the executable `ckb`.
  -First creates a directory to run CKB
  +First create a directory to run CKB
  ```shell
  mkdir ckb-dev
  cd ckb-dev
  ```
  -All the following commands will run in this same directory.
  +All the following commands will run in the same directory.
  Then init the directory with the default config files.
  