Fix typos - Singer -> Signer

Author: rhowe

codegen/src/main/java/software/amazon/awssdk/codegen/poet/auth/scheme/SigV4AuthSchemeCodegenKnowledgeIndex.java

@@ -134,7 +134,7 @@ private AuthSchemeCodegenMetadata sigV4AuthSchemeWithConstantOverrides(List<Auth
     }
 
     /**
-     * Returns a new list of singer properties with only those properties that use a constant value.
+     * Returns a new list of signer properties with only those properties that use a constant value.
      */
     private List<SignerPropertyValueProvider> filterSignerPropertiesWithConstantValues(
         List<SignerPropertyValueProvider> properties

services/polly/src/test/java/software/amazon/awssdk/services/polly/internal/presigner/DefaultPollyPresignerTest.java

@@ -90,7 +90,7 @@ void presign_requestLevelCredentials_honored() {
     }
 
     @Test
-    void presign_requestLevelSingerAndCredentials_honored() {
+    void presign_requestLevelSignerAndCredentials_honored() {
         IdentityProvider<AwsCredentialsIdentity> requestCedentialsProvider = StaticCredentialsProvider.create(
             AwsBasicCredentials.create("akid2", "skid2")
         );

services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/plugins/S3OverrideAuthSchemePropertiesPlugin.java

@@ -99,7 +99,7 @@ public void configureClient(SdkServiceClientConfiguration.Builder config) {
                 if (addConfiguredProperties(option, params)) {
                     AuthSchemeOption.Builder builder = option.toBuilder();
                     identityProperties.forEach((k, v) -> putIdentityProperty(builder, k, v));
-                    signerProperties.forEach((k, v) -> putSingerProperty(builder, k, v));
+                    signerProperties.forEach((k, v) -> putSignerProperty(builder, k, v));
                     result.add(builder.build());
                 } else {
                     result.add(option);
@@ -116,7 +116,7 @@ private <T> void putIdentityProperty(AuthSchemeOption.Builder builder, IdentityP
     }
 
     @SuppressWarnings("unchecked")
-    private <T> void putSingerProperty(AuthSchemeOption.Builder builder, SignerProperty<?> key, Object value) {
+    private <T> void putSignerProperty(AuthSchemeOption.Builder builder, SignerProperty<?> key, Object value) {
         // Safe because of Builder#putSignerProperty
         builder.putSignerProperty((SignerProperty<T>) key, (T) value);
     }