Fixes md lint

Author: arcanis

doc/api/packages.md

@@ -966,8 +966,8 @@ This feature is useful for:
   packages without symlinks or hoisting complexities.
 * **Dependency isolation**: Prevent packages from accessing undeclared
   dependencies (phantom dependencies).
-* **Low filesystem coupling**: The package resolution algorithm runs without
-  inspecting the filesystem, relying instead on static data tables.
+* **Low file system coupling**: The package resolution algorithm runs without
+  inspecting the file system, relying instead on static data tables.
 
 ### Configuration file format