Fix documents for deprecated session_storage

Configuring the API with session_storage is now deprecated.
Shopify/shopify-api-ruby#1055

README.md

@@ -52,19 +52,12 @@ ShopifyAPI::Context.setup(
   api_secret_key: "<api-secret-key>",
   host: "<https://application-host-name.com>",
   scope: "read_orders,read_products,etc",
-  session_storage: ShopifyAPI::Auth::FileSessionStorage.new, # See more details below
   is_embedded: true, # Set to true if you are building an embedded app
   api_version: "2022-01", # The version of the API you would like to use
   is_private: false, # Set to true if you have an existing private app
 )
 ```
 
-### Setup a Session Store
-
-In order for the Shopify API gem to properly store sessions it needs an implementation of `ShopifyAPI::Auth::SessionStorage`. We provide one implementation in the gem, `ShopifyAPI::Auth::FileSessionStorage`, which is suitable for testing/development, but isn't intended for production apps. See the [Session Storage doc](docs/usage/session_storage.md) for instructions on how to create a custom session store for a production application.
-
-Session information would is typically stored in cookies on the browser. However, due to restrictions with modern browsers we highly discourage using cookies for embedded apps. For this reason, an app needs to define a storage implementation that the library can use to store and retrieve a session given its ID. In a non-embedded app this ID will come from a cookie, whereas in an embedded app this ID will come from [App Bridge](https://shopify.dev/docs/apps/tools/app-bridge).
-
 ### Performing OAuth
 
 You need to go through OAuth as described [here](https://shopify.dev/docs/apps/auth/oauth) to create sessions for shops using your app.

docs/getting_started.md

@@ -26,19 +26,12 @@ ShopifyAPI::Context.setup(
   api_secret_key: "<api-secret-key>",
   host_name: "<application-host-name>",
   scope: "read_orders,read_products,etc",
-  session_storage: ShopifyAPI::Auth::FileSessionStorage.new, # This is only to be used for testing, more information in session docs
   is_embedded: true, # Set to true if you are building an embedded app
   is_private: false, # Set to true if you are building a private app
-  api_version: "2021-01" # The vesion of the API you would like to use
+  api_version: "2021-01" # The version of the API you would like to use
 )
 ```
 
-### Setup a Session Store
-
-In order for the Shopify API gem to properly store sessions it needs an implementation of `ShopifyAPI::Auth::SessionStorage`. There is one provided in the gem, `ShopifyAPI::Auth::FileSessionStorage`, this is suitable for testing, however it is not intended for production apps. See the [Session Storage doc](usage/session_storage.md) for instructions on how to create a custom session store for a production application.
-
-Normally session information would be stored in cookies on the browser. However, due to restrictions with modern browsers we highly discourage using cookies for embedded apps. For this reason, an app needs to define a storage implementation that can be used to store and retrieve a session given an ID. In a non embedded app this ID will come from a cookie however, in an embedded app this ID will come from [App Bridge](https://shopify.dev/docs/apps/tools/app-bridge)
-
 ### Performing OAuth
 
 Next, unless you are making a private app, you need to go through OAuth as described [here](https://shopify.dev/docs/apps/auth/oauth) to create sessions for shops using your app.