fix incorrect component reference

the correct name should be "DocButtonComponent"

Author: S1ngS1ng

examples/angular-cli/src/stories/addon-docs.stories.mdx

@@ -79,7 +79,7 @@ Let's add another one. The UI updates automatically as you'd expect.
 
 We can automatically generate props tables from Angular components:
 
-<ArgsTable of={DocsButtonComponent} />
+<ArgsTable of={DocButtonComponent} />
 
 ## More info