chore(docs): remove uneeded env vars

Author: Makeshift

docs/content/2.storage-drivers/s3.md

@@ -62,12 +62,7 @@ services:
 
       STORAGE_DRIVER: s3
       STORAGE_S3_BUCKET: gh-actions-cache
-      STORAGE_S3_ACCESS_KEY: access_key
-      STORAGE_S3_SECRET_KEY: secret_key
 
-      STORAGE_S3_ENDPOINT: s3.amazonaws.com
-      STORAGE_S3_PORT: '443'
-      STORAGE_S3_USE_SSL: 'true'
     volumes:
       - cache-data:/app/.data
 
@@ -79,36 +74,20 @@ volumes:
 
 Don't forget to set the `STORAGE_DRIVER` environment variable to `s3` to use the S3 storage driver.
 
+The AWS SDK will automatically use any AWS credentials available in the environment, e.g. `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY` and `AWS_REGION`.
+
 #### `STORAGE_S3_BUCKET`
 
 Example: `gh-actions-cache`
 
 The name of the S3 bucket used for storage.
 
-#### `STORAGE_S3_ACCESS_KEY`
-
-Example: `access_key`
-
-The access key for S3 storage.
-
-#### `STORAGE_S3_SECRET_KEY`
-
-Example: `secret_key`
-
-The secret key for S3 storage.
-
 #### `STORAGE_S3_ENDPOINT`
 
 Example: `s3.amazonaws.com`, `minio`
 
 The endpoint hostname for S3 storage.
 
-#### `STORAGE_S3_REGION`
-
-Example: `us-west-1`
-
-The region for AWS S3. Not needed with MinIO.
-
 #### `STORAGE_S3_PORT`
 
 Example: `443`, `9000`