rubocop: fix file/directory style

pages/osx/rubocop.md

@@ -8,11 +8,11 @@
 
 - Check one or more specific files or directories:
 
-`rubocop {{/path/to/file}} {{/path/to/directory}}`
+`rubocop {{path/to/file}} {{path/to/directory}}`
 
 - Write output to file:
 
-`rubocop --out {{/path/to/file}}`
+`rubocop --out {{path/to/file}}`
 
 - View list of cops (linter rules):