docs: used the NPX CLI tool across docs (#4099)

docs/content/development/cache/create.md

@@ -253,7 +253,7 @@ You can also add any necessary options to the module. The options added in the e
 Then, to test the module, run the Medusa backend which also runs your module:
 
 ```bash npm2yarn
-npm run start
+npx @medusajs/medusa-cli develop
 ```
 
 ---

docs/content/development/cache/modules/in-memory.md

@@ -64,7 +64,7 @@ This registers the in-memory cache module as the main cache service to use. You
 To test the module, run the following command to start the Medusa backend:
 
 ```bash npm2yarn
-npm run start
+npx @medusajs/medusa-cli develop
 ```
 
 The backend should then start with no errors, indicating that the module was installed successfully.

docs/content/development/cache/modules/redis.md

@@ -82,7 +82,7 @@ Other available options include:
 To test the module, run the following command to start the Medusa backend:
 
 ```bash npm2yarn
-npm run start
+npx @medusajs/medusa-cli develop
 ```
 
 If the module was installed successfully, you should see the following message in the logs: