Fix typos

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/annotation/DiscoveredOperationsFactory.java

@@ -37,7 +37,7 @@
 import org.springframework.core.annotation.AnnotationAttributes;
 
 /**
- * Factory to creates an {@link Operation} for a annotated methods on an
+ * Factory to create an {@link Operation} for annotated methods on an
  * {@link Endpoint @Endpoint} or {@link EndpointExtension @EndpointExtension}.
  *
  * @param <O> The operation type

spring-boot-project/spring-boot-docs/src/main/asciidoc/production-ready-features.adoc

@@ -1573,7 +1573,7 @@ be provided:
 	management.metrics.export.wavefront.api-token=YOUR_API_TOKEN
 ----
 
-Alternatively, you may use a a Wavefront sidecar or an internal proxy set up in your
+Alternatively, you may use a Wavefront sidecar or an internal proxy set up in your
 environment that forwards metrics data to the Wavefront API host:
 
 [source,properties,indent=0]

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/filter/FilterAnnotations.java

@@ -72,7 +72,7 @@ private TypeFilter createTypeFilter(FilterType filterType, Class<?> filterClass)
 		switch (filterType) {
 		case ANNOTATION:
 			Assert.isAssignable(Annotation.class, filterClass,
-					"An error occurred while processing a ANNOTATION type filter: ");
+					"An error occurred while processing an ANNOTATION type filter: ");
 			return new AnnotationTypeFilter((Class<Annotation>) filterClass);
 		case ASSIGNABLE_TYPE:
 			return new AssignableTypeFilter(filterClass);

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/json-shade/java/org/springframework/boot/configurationprocessor/json/JSONStringer.java

@@ -75,7 +75,7 @@ enum Scope {
 		EMPTY_ARRAY,
 
 		/**
-		 * A array with at least one value requires a comma and newline before the next
+		 * An array with at least one value requires a comma and newline before the next
 		 * element.
 		 */
 		NONEMPTY_ARRAY,