### 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
this.shouldFail = shouldFail;
            }
        }
        final List<MlockallCheckTestCase> testCases = new ArrayList<>();
        testCases.add(new MlockallCheckTestCase(true, true, false));
        testCases.add(new MlockallCheckTestCase(true, false, true));
        testCases.add(new MlockallCheckTestCase(false, true, false));
        testCases.add(new MlockallCheckTestCase(false, false, false));
        for (final MlockallCheckTestCase testCase : testCases) {
            final BootstrapChecks.MlockallCheck check = new BootstrapChecks.MlockallCheck() {
                @Override
                boolean isMemoryLocked() {
                    return testCase.isMemoryLocked;
                }
            };
            BootstrapContext bootstrapContext = createTestContext(
                Settings.builder().put("bootstrap.memory_lock", testCase.mlockallSet).build(),
                null
            );
            if (testCase.shouldFail) {
                final NodeValidationException e = expectThrows(
                    NodeValidationException.class,
                    () -> BootstrapChecks.check(bootstrapContext, true, Collections.singletonList(check))
                );
                assertThat(e.getMessage(), containsString("memory locking requested for elasticsearch process but memory is not locked"));
            } else {
                
                BootstrapChecks.check(bootstrapContext, true, Collections.singletonList(check));
            }
        }