update capabilities in docs.md

Author: jccampagne

core/services/opfs/src/docs.md

@@ -2,12 +2,12 @@
 
 This service can be used to:
 
-- [ ] create_dir
-- [ ] stat
-- [ ] read
-- [ ] write
-- [ ] delete
-- [ ] list
+- [x] create_dir
+- [x] stat
+- [x] read
+- [x] write
+- [x] delete
+- [x] list
 - [ ] copy
 - [ ] rename
 - [ ] presign