Added snippets for synchronous APIs and finished last of the snippets. (Azure#25672)

Author: LarryOsterman

sdk/attestation/azure-security-attestation/src/main/java/com/azure/security/attestation/AttestationAdministrationAsyncClient.java

@@ -254,7 +254,7 @@ public AttestationAdministrationClientBuilder addPolicy(HttpPipelinePolicy custo
         *     .tokenValidationOptions(new AttestationTokenValidationOptions()
         *         .setValidationSlack(Duration.ofSeconds(10)) // Allow 10 seconds of clock drift between attestation service and client.
         *         .setValidationCallback((token, signer) -> { // Perform custom validation steps.
-        *             System.out.printf("Validate token signed by signer %s", signer.getCertificates().get(0).getSubjectDN().toString());
+        *             System.out.printf("Validate token signed by signer %s\n", signer.getCertificates().get(0).getSubjectDN().toString());
         *         }))
         *     .buildClient();
         * </pre>

sdk/attestation/azure-security-attestation/src/main/java/com/azure/security/attestation/AttestationAdministrationClient.java

@@ -222,8 +222,8 @@ public Mono<AttestationOpenIdMetadata> getOpenIdMetadata() {
      * <p><strong>Retrieve Attestation Signers for this async client.</strong></p>
      * <!-- src_embed com.azure.security.attestation.AttestationAsyncClient.getAttestationSigners -->
      * <pre>
-     * Mono&lt;List&lt;AttestationSigner&gt;&gt; signers = client.listAttestationSigners&#40;&#41;;
-     * signers.block&#40;&#41;.forEach&#40;cert -&gt; &#123;
+     * Mono&lt;List&lt;AttestationSigner&gt;&gt; signersMono = client.listAttestationSigners&#40;&#41;;
+     * signersMono.subscribe&#40;signers -&gt; signers.forEach&#40;cert -&gt; &#123;
      *     System.out.println&#40;&quot;Found certificate.&quot;&#41;;
      *     if &#40;cert.getKeyId&#40;&#41; != null&#41; &#123;
      *         System.out.println&#40;&quot;    Certificate Key ID: &quot; + cert.getKeyId&#40;&#41;&#41;;
@@ -234,7 +234,7 @@ public Mono<AttestationOpenIdMetadata> getOpenIdMetadata() {
      *         System.out.println&#40;&quot;        Cert Subject: &quot; + chainElement.getSubjectDN&#40;&#41;.getName&#40;&#41;&#41;;
      *         System.out.println&#40;&quot;        Cert Issuer: &quot; + chainElement.getIssuerDN&#40;&#41;.getName&#40;&#41;&#41;;
      *     &#125;&#41;;
-     * &#125;&#41;;
+     * &#125;&#41;&#41;;
      * </pre>
      * <!-- end com.azure.security.attestation.AttestationAsyncClient.getAttestationSigners -->
      *

sdk/attestation/azure-security-attestation/src/main/java/com/azure/security/attestation/AttestationAdministrationClientBuilder.java

@@ -220,7 +220,7 @@ public AttestationClientBuilder addPolicy(HttpPipelinePolicy customPolicy) {
      *     .tokenValidationOptions(new AttestationTokenValidationOptions()
      *         .setValidationSlack(Duration.ofSeconds(10)) // Allow 10 seconds of clock drift between attestation service and client.
      *         .setValidationCallback((token, signer) -> { // Perform custom validation steps.
-     *             System.out.printf("Validate token signed by signer %s", signer.getCertificates().get(0).getSubjectDN().toString());
+     *             System.out.printf("Validate token signed by signer %s\n", signer.getCertificates().get(0).getSubjectDN().toString());
      *         }))
      *     .buildClient();
      * </pre>