chore(docs): Updated API Reference (#6220)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

www/apps/api-reference/specs/admin/paths/admin_regions.yaml

@@ -6,6 +6,16 @@ get:
     `created_at`. The regions can also be paginated.
   x-authenticated: true
   parameters:
+    - in: query
+      name: q
+      description: Term used to search regions' name.
+      schema:
+        type: string
+    - in: query
+      name: order
+      description: A field to sort-order the retrieved regions by.
+      schema:
+        type: string
     - in: query
       name: limit
       schema:
@@ -100,7 +110,7 @@ get:
     - lang: tsx
       label: Medusa React
       source:
-        $ref: ../code_samples/tsx/admin_regions/getundefined
+        $ref: ../code_samples/tsx/admin_regions/get.tsx
     - lang: Shell
       label: cURL
       source:
@@ -150,7 +160,7 @@ post:
     - lang: tsx
       label: Medusa React
       source:
-        $ref: ../code_samples/tsx/admin_regions/postundefined
+        $ref: ../code_samples/tsx/admin_regions/post.tsx
     - lang: Shell
       label: cURL
       source: