Polish "Add pullPolicy option for image building"

See gh-22736

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/asciidoc/packaging-oci-image.adoc

@@ -61,6 +61,12 @@ The following table summarizes the available properties and their default values
 | {spring-boot-api}/buildpack/platform/docker/type/ImageReference.html#of-java.lang.String-[Image name] for the generated image.
 | `docker.io/library/${project.artifactId}:${project.version}`
 
+| `pullPolicy`
+| `--pullPolicy`
+| {spring-boot-api}/buildpack/platform/build/PullPolicy.html[Policy] used to determine when to pull the builder and run images from the registry.
+Acceptable values are `ALWAYS`, `NEVER`, and `IF_NOT_PRESENT`.
+| `ALWAYS`
+
 | `environment`
 |
 | Environment variables that should be passed to the builder.