Identity Credential: Update docs to mention valid range for ACP identifiers.

Bug: 155100967
Test: atest android.security.identity.cts
Change-Id: I850e667676d3488be786447ed3ad33c80444f5e2

identity/java/android/security/identity/AccessControlProfileId.java

@@ -25,6 +25,8 @@ public class AccessControlProfileId {
     /**
      * Constructs a new object holding a numerical identifier.
      *
+     * <p>The identifier must be a non-negative number and less than 32.
+     *
      * @param id the identifier.
      */
     public AccessControlProfileId(int id) {

identity/java/android/security/identity/IdentityCredentialStore.java

@@ -46,7 +46,7 @@ import java.lang.annotation.RetentionPolicy;
  * access control profile IDs.  Names are strings and values are typed and can be any
  * value supported by <a href="http://cbor.io/">CBOR</a>.</li>
  *
- * <li>A set of access control profiles, each with a profile ID and a specification
+ * <li>A set of access control profiles (up to 32), each with a profile ID and a specification
  * of the conditions which satisfy the profile's requirements.</li>
  *
  * <li>An asymmetric key pair which is used to authenticate the credential to the Issuing