docs(material/core): fix wrong mixin name (#25067)
docs(material/core): fix wrong mixin name (#25067)

* fix(docs/typography-guide): Defining a level

* Merge pull request #1 from atrawally/typography-docs-bug

fix(docs/typography-guide): Defining a level

crisbeto/material2,angular/components,angular/components,crisbeto/material2,angular/components,crisbeto/material2,crisbeto/material2,angular/components