[attestation] Document pVM remote attestation

Bug: 330868880
Test: N/A pure document update
Change-Id: Ib4514f1d76e8df192528e7a2741a4a1c88b0709f
diff --git a/service_vm/requests/src/cert.rs b/service_vm/requests/src/cert.rs
index 91281e7..e31d870 100644
--- a/service_vm/requests/src/cert.rs
+++ b/service_vm/requests/src/cert.rs
@@ -43,7 +43,7 @@
 /// Attestation extension contents
 ///
 /// ```asn1
-/// AttestationDescription ::= SEQUENCE {
+/// AttestationExtension ::= SEQUENCE {
 ///     attestationChallenge       OCTET_STRING,
 ///     isVmSecure                 BOOLEAN,
 ///     vmComponents               SEQUENCE OF VmComponent,