Fix typo

Author: fabpot

Deprecation/README.md

@@ -22,5 +22,5 @@ trigger_deprecation('symfony/blockchain', '8.9', 'Using "%s" is deprecated, use
 This will generate the following message:
 `Since symfony/blockchain 8.9: Using "bitcoin" is deprecated, use "fabcoin" instead.`
 
-While not necessarily recommended, the deprecation notices can be completely ignored by declaring an empty
+While not recommended, the deprecation notices can be completely ignored by declaring an empty
 `function trigger_deprecation() {}` in your application.