osx/as.md: update placeholders

* Make placeholders recognizable by CLIP converter

- https://github.com/command-line-interface-pages/prototypes/pull/32

* Update pages/osx/as.md

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/osx/as.md

@@ -6,16 +6,16 @@
 
 - Assemble a file, writing the output to `a.out`:
 
-`as {{file.s}}`
+`as {{path/to/file.s}}`
 
 - Assemble the output to a given file:
 
-`as {{file.s}} -o {{out.o}}`
+`as {{path/to/file.s}} -o {{path/to/output_file.o}}`
 
 - Generate output faster by skipping whitespace and comment preprocessing. (Should only be used for trusted compilers):
 
-`as -f {{file.s}}`
+`as -f {{path/to/file.s}}`
 
 - Include a given path to the list of directories to search for files specified in `.include` directives:
 
-`as -I {{path/to/directory}} {{file.s}}`
+`as -I {{path/to/directory}} {{path/to/file.s}}`