update default react import eslint warning

Signed-off-by: Paul Schultz <pschultz@pobox.com>

.changeset/twelve-wolves-run.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Included a reference to the JSX transform guide in the warning about using the default React import.

packages/cli/config/eslint-factory.js

@@ -249,13 +249,13 @@ function createConfigForRole(dir, role, extraConfig = {}) {
             'warn',
             {
               message:
-                'React default imports are deprecated. Follow the x migration guide for details.',
+                'React default imports are deprecated. Follow the https://backstage.io/docs/tutorials/jsx-transform-migration migration guide for details.',
               selector:
                 "ImportDeclaration[source.value='react'][specifiers.0.type='ImportDefaultSpecifier']",
             },
             {
               message:
-                'React default imports are deprecated. Follow the x migration guide for details. If you need a global type that collides with a React named export (such as `MouseEvent`), try using `globalThis.MouseHandler`.',
+                'React default imports are deprecated. Follow the https://backstage.io/docs/tutorials/jsx-transform-migration migration guide for details. If you need a global type that collides with a React named export (such as `MouseEvent`), try using `globalThis.MouseHandler`.',
               selector:
                 "ImportDeclaration[source.value='react'] :matches(ImportDefaultSpecifier, ImportNamespaceSpecifier)",
             },