[README.md]: improve syntax

README.md

@@ -9,16 +9,28 @@ Support C, C++, PHP, Python, ECMAScript, HTML, Sass, less, Markdown
 ### Markdown Mode
 - Require installed markdown in distro GNU+Linux, example:
 
-  `apt-get install markdown` or `pacman -S markdown`
+```console
+# apt-get install markdown
+```
+
+```console
+# pacman -S markdown
+```
 
 ### Flycheck Mode
 - Require installed the languages checking, example:
 
-  `pacman -S shellcheck`    # bash, sh
+```console
+# pacman -S shellcheck
+```
 
-  `pacman -S eslint`        # ECMAScript
+```console
+# pacman -S eslint
+```
 
-  `pacman -S python-pylint` # python
+```console
+# pacman -S python-pylint
+```
 
 ### License
 - [GLPv3](LICENSE)