docs: fix typo in glossary (#38318)

Add missing comma  in structural directive section that made dash display incorrectly.

PR Close #38318
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Zara Cooper 2020-07-31 21:10:18 +03:00 committed by Andrew Kushnir
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@ -867,7 +867,7 @@ To learn more, see [Introduction to Services and Dependency Injection](guide/arc
## structural directives
A category of [directive](#directive) that is responsible for shaping HTML layout by modifying the DOM&mdashthat is, adding, removing, or manipulating elements and their children.
A category of [directive](#directive) that is responsible for shaping HTML layout by modifying the DOM—that is, adding, removing, or manipulating elements and their children.
To learn more, see [Structural Directives](guide/structural-directives).