### Description

The [bootstrap checks docs for 8.1](https://github.com/elastic/elasticsearch/blob/8.1/docs/reference/setup/bootstrap-checks.asciidoc#system-call-filter-check) still have a [section for disabling system call filters](https://www.elastic.co/guide/en/elasticsearch/reference/8.1/_system_call_filter_check.html) even though that setting was removed in 8.0 (#72848) and its removal is [listed in the breaking changes](https://www.elastic.co/guide/en/elastic-stack/8.0/elasticsearch-breaking-changes.html)


server/src/test/java/org/elasticsearch/bootstrap/BootstrapChecksTests.java
isSystemCallFilterInstalled,
            () -> onError.set(randomBoolean() ? "" : null),
            () -> onError.set(command),
            e -> assertThat(
                e.getMessage(),
                containsString(
                    "OnError ["
                        + command
                        + "] requires forking but is prevented by system call filters;"
                        + " upgrade to at least Java 8u92 and use ExitOnOutOfMemoryError"
                )
            )
        );
    }
    public void testOnOutOfMemoryErrorCheck() throws NodeValidationException {
        final AtomicBoolean isSystemCallFilterInstalled = new AtomicBoolean();
        final AtomicReference<String> onOutOfMemoryError = new AtomicReference<>();
        final BootstrapChecks.MightForkCheck check = new BootstrapChecks.OnOutOfMemoryErrorCheck() {
            @Override
            boolean isSystemCallFilterInstalled() {
                return isSystemCallFilterInstalled.get();
            }
            @Override
            String onOutOfMemoryError() {
                return onOutOfMemoryError.get();
            }
        };
        final String command = randomAlphaOfLength(16);
        runMightForkTest(
            check,