tweak message

Author: zth

compiler/ext/warnings.ml

@@ -311,8 +311,9 @@ let message = function
     if can_be_automigrated then
       "\n\n\
       \  This can be automatically migrated by the ReScript migration tool. \
-       Run `rescript-tools migrate-all` to run all automatic migrations \
-       available in your project."
+       Run `rescript-tools migrate-all <project-root>` to run all automatic \
+       migrations available in your project, or `rescript-tools migrate \
+       <file>` to migrate a single file."
     else ""
   | Fragile_match "" -> "this pattern-matching is fragile."
   | Fragile_match s ->

tests/build_tests/super_errors/expected/deprecated_with_automigration.res.expected

@@ -8,4 +8,4 @@
   deprecated: Js.Array2.map
   Use `Array.map` instead.
 
-  This can be automatically migrated by the ReScript migration tool. Run `rescript-tools migrate-all` to run all automatic migrations available in your project.
+  This can be automatically migrated by the ReScript migration tool. Run `rescript-tools migrate-all <project-root>` to run all automatic migrations available in your project, or `rescript-tools migrate <file>` to migrate a single file.