test: small test description semantic fix

Author: grzuy

spec/webauthn/attestation_statement/none_spec.rb

@@ -32,7 +32,7 @@
       expect(WebAuthn::AttestationStatement::None.new("a" => "b").valid?(authenticator_data, nil)).to be_falsy
     end
 
-    it "returns false if None is not among the acceptable formats" do
+    it "returns false if None is not among the acceptable attestation types" do
       WebAuthn.configuration.acceptable_attestation_types = ['AttCA']
 
       expect(WebAuthn::AttestationStatement::None.new({}).valid?(authenticator_data, nil)).to be_falsy