Hi!
It looks like server with migration guide is unavailable (https://material-ui.com/style/typography#migration-to-typography-v2).

Above link is displayed when Typography warning is shown:

Warning: Material-UI: You are using the typography variant body1 which will be restyled in the next major release. 
Please read the migration guide under https://material-ui.com/style/typography#migration-to-typography-v2

After click I'm redirected to https://v3-9-0.material-ui.com/style/typography/#migration-to-typography-v2 and that server is unavailable

v3-9-0.material-ui.com’s server IP address could not be found.

• This is not a v0.x issue.
• I have searched the issues of this repository and believe that this is not a duplicate.

Expected Behavior 🤔

Migration guide is available

Current Behavior 😯

Migration guide is unavailable

Steps to Reproduce 🕹

Type https://material-ui.com/style/typography#migration-to-typography-v2 in any browser