just output the filename without the full path for now

Author: zth

tests/tools_tests/src/expected/FormatDocstringsTestError.res.expected

@@ -1,6 +1,6 @@
 
   Syntax error in code block in docstring
-  /Users/zth/OSS/rescript-compiler/tests/tools_tests/src/docstrings-format/FormatDocstringsTestError.res:5:10-6:3
+  FormatDocstringsTestError.res:5:10-6:3
 
   3 │ 
   4 │ 

tools/src/tools.ml

@@ -823,7 +823,7 @@ module FormatDocstrings = struct
         let {Res_driver.parsetree = structure; comments; source; filename} =
           parser ~filename:path
         in
-
+        let filename = Filename.basename filename in
         let mapper = makeMapper ~displayFilename:filename in
         let astMapped = mapper.structure mapper structure in
         ( Res_printer.print_implementation