Update snippet descriptions

snippets/untildify.md

@@ -5,12 +5,13 @@ tags: node,string,beginner
 
 Converts a tilde path to an absolute path.
 
-- Use `String.prototype.replace()` with a regular expression and `OS.homedir()` to replace the `~` in the start of the path with the home directory.
+- Use `String.prototype.replace()` with a regular expression and `os.homedir()` to replace the `~` in the start of the path with the home directory.
 
 ```js
-const untildify = str => str.replace(/^~($|\/|\\)/, `${require('os').homedir()}$1`);
+const untildify = str =>
+  str.replace(/^~($|\/|\\)/, `${require('os').homedir()}$1`);
 ```
 
 ```js
 untildify('~/node'); // '/Users/aUser/node'
-```
+```