GH-8728: Fix Transformer typo in the doc

Fixes #8728

Author: artembilan

src/reference/antora/modules/ROOT/pages/transformer.adoc

@@ -23,7 +23,7 @@ For simple Java & Annotation configuration, the Spring bean POJO method must be
 ----
 public class SomeService {
 
-    @Transfomer(inputChannel = "transformChannel", outputChannel = "nextServiceChannel")
+    @Transformer(inputChannel = "transformChannel", outputChannel = "nextServiceChannel")
     public OutputData exampleTransformer(InputData payload) {
         ...
     }

src/reference/antora/modules/ROOT/pages/zip.adoc

@@ -115,7 +115,7 @@ Java::
 +
 [source, java, role="secondary"]
 ----
-@Transfomer(inputChannel = "zipChannel")
+@Transformer(inputChannel = "zipChannel")
 @Bean
 ZipTransformer zipTransformer() {
     return new ZipTransformer();
@@ -194,7 +194,7 @@ Java::
 +
 [source, java, role="secondary"]
 ----
-@Transfomer(inputChannel = "unzipChannel")
+@Transformer(inputChannel = "unzipChannel")
 @Bean
 UnZipTransformer unzipTransformer() {
     return new UnZipTransformer();
@@ -271,7 +271,7 @@ Java::
 +
 [source, java, role="secondary"]
 ----
-@Transfomer(inputChannel = "unzipChannel", outputChannel = "splitChannel")
+@Transformer(inputChannel = "unzipChannel", outputChannel = "splitChannel")
 @Bean
 UnZipTransformer unzipTransformer() {
     return new UnZipTransformer();