update std/os/filepath

Author: mertcandav

src/std/os-filepath.md

@@ -35,15 +35,11 @@ fn Clean(path: str): str
 ```
 Returns the shortest path name equivalent to path by purely lexical processing\. It applies the following rules iteratively until no further processing can be done:
 
-```
-1. Replace multiple SEPARATOR elements with a single one.
-2. Eliminate each . path name element (the current directory).
-3. Eliminate each inner .. path name element (the parent directory)
-			along with the non-.. element that precedes it.
-4. Eliminate .. elements that begin a rooted path:
-			that is, replace "/.." by "/" at the beginning of a path,
-			assuming SEPARATOR is '/'.
-```
+1. Replace multiple SEPARATOR elements with a single one\.
+2. Eliminate each \. path name element \(the current directory\)\.
+3. Eliminate each inner \.\. path name element \(the parent directory\) along with the non\-\.\. element that precedes it\.
+4. Eliminate \.\. elements that begin a rooted path: that is, replace "/\.\." by "/" at the beginning of a path, assuming SEPARATOR is '/'\.
+
 The returned path ends in a slash only if it represents a root directory, such as "/" on Unix or \`C:\\\` on Windows\.
 
 Finally, any occurrences of slash are replaced by SEPARATOR\.