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_publishable-api-keys.yaml

@@ -51,7 +51,7 @@ get:
     - lang: tsx
       label: Medusa React
       source:
-        $ref: ../code_samples/tsx/admin_publishable-api-keys/getundefined
+        $ref: ../code_samples/tsx/admin_publishable-api-keys/get.tsx
     - lang: Shell
       label: cURL
       source:
@@ -101,7 +101,7 @@ post:
     - lang: tsx
       label: Medusa React
       source:
-        $ref: ../code_samples/tsx/admin_publishable-api-keys/postundefined
+        $ref: ../code_samples/tsx/admin_publishable-api-keys/post.tsx
     - lang: Shell
       label: cURL
       source: