change ParameterCustomizer interface and review code formatting

Author: bnasslahsen

springdoc-openapi-common/src/main/java/org/springdoc/core/customizers/OpenApiBuilderCustomiser.java

@@ -20,6 +20,7 @@
 
 import org.springdoc.core.OpenAPIBuilder;
 
+@FunctionalInterface
 public interface OpenApiBuilderCustomiser {
 
 	void customise(OpenAPIBuilder openApiBuilder);

springdoc-openapi-common/src/main/java/org/springdoc/core/customizers/OpenApiCustomiser.java

@@ -20,6 +20,7 @@
 
 import io.swagger.v3.oas.models.OpenAPI;
 
+@FunctionalInterface
 public interface OpenApiCustomiser {
 
 	void customise(OpenAPI openApi);

springdoc-openapi-common/src/main/java/org/springdoc/core/customizers/OperationCustomizer.java

@@ -26,6 +26,7 @@
  * Implement and register a bean of type {@link OperationCustomizer} to customize an operation
  * based on the handler method input
  */
+@FunctionalInterface
 public interface OperationCustomizer {
 
 	/**

springdoc-openapi-common/src/main/java/org/springdoc/core/customizers/ParameterCustomizer.java

@@ -26,6 +26,7 @@
  * Implement and register a bean of type {@link ParameterCustomizer} to customize a parameter
  * based on the parameter and handler method input
  */
+@FunctionalInterface
 public interface ParameterCustomizer {
 	/**
 	 * @param parameterModel to be customized

springdoc-openapi-common/src/main/java/org/springdoc/core/customizers/PropertyCustomizer.java

@@ -25,6 +25,7 @@
  * Implement and register a bean of type {@link PropertyCustomizer} to customize a schema property
  * based on annotated type
  */
+@FunctionalInterface
 public interface PropertyCustomizer {
 
 	/**