### 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,
            () -> onOutOfMemoryError.set(randomBoolean() ? "" : null),
            () -> onOutOfMemoryError.set(command),
            e -> assertThat(
                e.getMessage(),
                containsString(
                    "OnOutOfMemoryError ["
                        + command
                        + "]"
                        + " requires forking but is prevented by system call filters;"
                        + " upgrade to at least Java 8u92 and use ExitOnOutOfMemoryError"
                )
            )
        );
    }
    private void runMightForkTest(
        final BootstrapChecks.MightForkCheck check,
        final AtomicBoolean isSystemCallFilterInstalled,
        final Runnable disableMightFork,
        final Runnable enableMightFork,
        final Consumer<NodeValidationException> consumer
    ) throws NodeValidationException {
        
        isSystemCallFilterInstalled.set(false);
        if (randomBoolean()) {
            disableMightFork.run();
        } else {
            enableMightFork.run();
        }
        BootstrapChecks.check(emptyContext, true, Collections.singletonList(check));