InlineVariableComment fix breaks on commented var block

We've recently added the InlineVariableComment rule, which attempts to fix all inline @var comments which aren't using the /** */ delimiters. This currently results in broken PHP code when the /** */ delimiters are contained within a comment, as it will attempt to add a doc comment within a doc comment, for example:

// /** @var \Drupal\node\NodeInterface $node */

Will result in:

/** /** @var \Drupal\node\NodeInterface $node */ */

We should probably just ignore the @var comments when they're contained within another comment, as it will most likely just be a commented piece of code.