Problem/Motivation
As discovered by @xjm in #3327853-34: [10.0.x and 9.5.x backports] Don't allow {@inheritDoc} annotation in PHPDocBlocks there are a few occurrences of @inheritdoc around (Note the missing curly braces).
Since we already have Slevomat rules to check for the unwanted {@inheritDoc} and @inheritDoc, let's add another one to check for @inheritdoc.