Typo fixes

index.bs

@@ -67,7 +67,7 @@ spec: WebCryptoAPI; urlPrefix: https://www.w3.org/TR/WebCryptoAPI/
         text: normalizing an algorithm; url: dfn-normalize-an-algorithm
         text: recognized algorithm name
     type: dictionary
-        text: AlgorithmIdentifier; url: dfn-AlgorithmIdentifierS
+        text: AlgorithmIdentifier; url: dfn-AlgorithmIdentifier
 
 <!-- Remove these once Shepherd picks up the changes -->
 spec: CREDENTIAL-MANAGEMENT-1; urlPrefix: https://w3c.github.io/webappsec-credential-management/
@@ -2245,7 +2245,7 @@ been used for the attestation=] is consistent with the fields of the attestation
 
     Concatenate |authenticatorData| and |clientDataHash| to form |attToBeSigned|.
 
-    Request a Android Key Attestation by calling "keyStore.getCertificateChain(myKeyUUID)") providing |attToBeSigned| as the
+    Request an Android Key Attestation by calling "keyStore.getCertificateChain(myKeyUUID)") providing |attToBeSigned| as the
     challenge value (e.g., by using
     <a href="https://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.Builder.html#setAttestationChallenge(byte%5B%5D)">
     setAttestationChallenge</a>),