Manual.rst: fix missing '!' in sqlValidate

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passed #5589
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  Selenium
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selenium
 
Name Stage Failure
failed
snapshot Build
/home/gitlab-runner/builds/z2S3Mwv6/0/typo3/qfq/typo3conf/ext/qfq/Tests/Unit/Core/Report/LinkTest.php:1522

FAILURES!
Tests: 347, Assertions: 1999, Failures: 1.
Makefile:110: recipe for target 'phpunit' failed
make: *** [phpunit] Error 1
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit status 1