doc: simplify recommendation in webcrypto.md

PR-URL: nodejs/node#42554
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>

doc/api/webcrypto.md

@@ -1020,7 +1020,7 @@ added: v15.0.0
 * Type: {ArrayBuffer|TypedArray|DataView|Buffer}
 
 The initialization vector must be unique for every encryption operation
-using a given key. It is recommended by the AES-GCM specification that
+using a given key. The AES-GCM specification recommends that
 this contain at least 12 random bytes.
 
 #### `aesGcmParams.name`