md5: update path placeholders, add Spanish translation (#10513)

* md5: add Spanish translation

* md5: update path placeholders

---------

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

pages/osx/md5.md

@@ -5,15 +5,15 @@
 
 - Calculate the MD5 checksum for a file:
 
-`md5 {{filename}}`
+`md5 {{path/to/file}}`
 
 - Calculate MD5 checksums for multiple files:
 
-`md5 {{filename1}} {{filename2}}`
+`md5 {{path/to/file1 path/to/file2 ...}}`
 
 - Output only the md5 checksum (no filename):
 
-`md5 -q {{filename}}`
+`md5 -q {{path/to/file}}`
 
 - Print a checksum of the given string: