Remove unused interceptors (#6502)

Author: zoewangg

services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/handlers/ConfigureSignerInterceptor.java

@@ -31,9 +31,14 @@
 import software.amazon.awssdk.core.sync.RequestBody;
 import software.amazon.awssdk.http.Header;
 import software.amazon.awssdk.http.SdkHttpRequest;
+import software.amazon.awssdk.services.s3.LegacyMd5Plugin;
 import software.amazon.awssdk.utils.Md5Utils;
 import software.amazon.awssdk.utils.StringUtils;
 
+/**
+ * Not directly used in the SDK; it's used in a standalone SDK plugin - {@link LegacyMd5Plugin} that enables md5 checksum
+ * calculation.
+ */
 @SdkInternalApi
 public class LegacyMd5ExecutionInterceptor implements ExecutionInterceptor {
 

services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/handlers/DisablePayloadSigningInterceptor.java

@@ -39,7 +39,7 @@
  * methods to create plugins for common cases such as enable payload signing by default. For instance, if you want
  * to unconditionally enable payload signing across the board you can create the S3 client, e.g.,
  *
- * {@snippet
+ * {@snippet :
  * S3AsyncClient s3 = S3AsyncClient.builder()
  *                                 .region(Region.US_WEST_2)
  *                                 .credentialsProvider(CREDENTIALS)
@@ -50,7 +50,7 @@
  *
  * The plugin can also be used for a particular request, e.g.,
  *
- * {@snippet
+ * {@snippet :
  * s3Client.putObject(PutObjectRequest.builder()
  *                            .overrideConfiguration(c -> c.addPlugin(
  *                                S3OverrideAuthSchemePropertiesPlugin.enablePayloadSigningPlugin()))