Improve README example code

re-rolled #3 https://www.drupal.org/project/encrypt/issues/2764427#comment-11393983 and stripped extra spaces on lines

readme.md

 # Encrypt Module for Drupal 8
 
-This module provides a global encryption service that can be invoked via the 
+This module provides a global encryption service that can be invoked via the
 services interface.
 
 ## Architecture
 
-Encrypt leverages the Drupal 8 Plugin API for Encryption Methods. It also 
-leverages the Key module for maintenance of encryption Keys. 
+Encrypt leverages the Drupal 8 Plugin API for Encryption Methods. It also
+leverages the Key module for maintenance of encryption Keys.
 
-Plugins allow for extensibility for customized needs. 
+Plugins allow for extensibility for customized needs.
 
 ## Settings
 
-The service is configured through the settings form, found at 
+The service is configured through the settings form, found at
 `/admin/config/system/encryption`.
 
-It requires a key, which is provided by the Key module. To manage keys, visit 
+It requires a key, which is provided by the Key module. To manage keys, visit
 `/admin/config/system/keys`.
 
 ## Best practices
 
-In order to provide real security, it is highly recommended to follow these 
+In order to provide real security, it is highly recommended to follow these
 best practices:
 
 ### Encryption method
 
 Use a high-quality, modern security library for encrypting your data.
-The Real AES module (https://www.drupal.org/project/real_aes) provides 
+The Real AES module (https://www.drupal.org/project/real_aes) provides
 integration with the recommended Defuse PHP Encryption library.
 
-Read the README.txt document provided by the Real AES module for detailed 
-security information and best practices, as well as further background 
+Read the README.txt document provided by the Real AES module for detailed
+security information and best practices, as well as further background
 information.
 
 Encrypt RSA module (https://www.drupal.org/project/encrypt_rsa) provides
@@ -48,27 +48,35 @@ Make sure to store your keys in an appropriately secure place. Keep your keys
 out of the database, out of the web root and on a different server, if possible.
 
 The "Configuration" key provider (as defined by the Key module) should only be
-used for testing purposes. Never use this key provider in a production 
-environment, or any environment where security is required. 
+used for testing purposes. Never use this key provider in a production
+environment, or any environment where security is required.
 
 
-## Use of Services
+## Using the service
 
-After configuring the service, the service provides the ability to encrypt and 
+After configuring the service, the service provides the ability to encrypt and
 decrypt using your encryption profile (machine name).
 
+### Get the service
+
+```
+/** @var \Drupal\encrypt\EncryptServiceInterface $encrypt_service */
+$encrypt_service = Drupal::service('encryption');
+
+$profile_id = 'example_machine_name';
+/** @var \Drupal\encrypt\EncryptionProfileInterface $encryption_profile */
+$encryption_profile = \Drupal::entityTypeManager()
+  ->getStorage('encryption_profile')->load($profile_id);
+```
+
 ### Encrypt
 ```
-use Drupal\encrypt\Entity\EncryptionProfile;
-$encryption_profile = EncryptionProfile::load($instance_id);
-Drupal::service('encryption')->encrypt($string, $encryption_profile);
+$encrypted_string = $encrypt_service->encrypt($string_to_encrypt, $encryption_profile);
 ```
 
 ### Decrypt
 ```
-use Drupal\encrypt\Entity\EncryptionProfile;
-$encryption_profile = EncryptionProfile::load($instance_id);
-Drupal::service('encryption')->decrypt($string, $encryption_profile);
+$decrypted_string = $encrypt_service->decrypt($string_to_decrypt, $encryption_profile);
 ```
 
 ### Note
@@ -87,8 +95,8 @@ data! [Read more about symmetric and asymmetric cryptography.](https://en.wikipe
 ## Writing your own EncryptionMethod plugin
 
 In you want to write your own encryption method plugin, you should extend the
-EncryptionMethodBase class and implement the methods defined by the 
-EncryptionMethodInterface. See the TestEncryptionMethod class in the 
+EncryptionMethodBase class and implement the methods defined by the
+EncryptionMethodInterface. See the TestEncryptionMethod class in the
 encrypt_test module bundled in the "tests" directory of this module.
 
 Optionally, your encryption method plugin can provide a configuration form, that