[openthread] Fix reference (#6866)

Author: clydebarrow

src/content/docs/components/openthread.mdx

@@ -120,7 +120,7 @@ on_...:
 
 ### Configuration Variables
 
-- **poll_period** (**Required**, [Time](/guides/configuration-types#config-time)): The poll period to apply, e.g. the
+- **poll_period** (**Required**, [Time](/guides/configuration-types#time)): The poll period to apply, e.g. the
   short form `openthread.set_poll_period: 5s`.
 
 ## OpenThread Device Type