Polishing contribution

Closes gh-35294

spring-web/src/main/java/org/springframework/http/ProblemDetail.java

@@ -102,7 +102,8 @@ public class ProblemDetail implements Serializable {
 
 	/**
 	 * Setter for the {@link #getType() problem type}.
-	 * <p>By default, this is not set. According to the spec, when not present, its value is assumed to be "about:blank"
+	 * <p>By default, this is not set. According to the spec, when not present,
+	 * the type is assumed to be "about:blank"
 	 * @param type the problem type
 	 */
 	public void setType(@Nullable URI type) {

spring-web/src/main/java/org/springframework/web/DefaultErrorResponseBuilder.java

@@ -85,7 +85,7 @@ final class DefaultErrorResponseBuilder implements ErrorResponse.Builder {
 	}
 
 	@Override
-	public ErrorResponse.Builder type(URI type) {
+	public ErrorResponse.Builder type(@Nullable URI type) {
 		this.problemDetail.setType(type);
 		return this;
 	}

spring-web/src/main/java/org/springframework/web/ErrorResponseException.java

@@ -111,7 +111,7 @@ public class ErrorResponseException extends NestedRuntimeException implements Er
 	 * Set the {@link ProblemDetail#setType(URI) type} field of the response body.
 	 * @param type the problem type
 	 */
-	public void setType(URI type) {
+	public void setType(@Nullable URI type) {
 		this.body.setType(type);
 	}