doc: clarify getAuthTag with authTagLength

Refs: #40272
Refs: #20235

PR-URL: #40713
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/crypto.md

@@ -551,6 +551,9 @@ added: v1.0.0
 The `cipher.getAuthTag()` method should only be called after encryption has
 been completed using the [`cipher.final()`][] method.
 
+If the `authTagLength` option was set during the `cipher` instance's creation,
+this function will return exactly `authTagLength` bytes.
+
 ### `cipher.setAAD(buffer[, options])`
 
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