[core] Consistent URL add leading /

CHANGELOG.md

@@ -10382,7 +10382,7 @@ A big thanks to the 34 contributors who made this release possible. Here are som
 - [theme] Add htmlFontSize to Typography interface (#23412) @fergusmcdonald
 - [Tooltip] Fix PopperProps popper modifiers not being merged properly (#23421) @dominique-mueller
 - [Tooltip] Long press select text on iOS (#23466) @hmaddisb
-- [Tooltip] Unexpected behaviour onOpen/onClose (#23482) @brorlarsnicklas
+- [Tooltip] Unexpected behavior onOpen/onClose (#23482) @brorlarsnicklas
 
 ### `@material-ui/[email protected]`
 

docs/pages/blog/discord-announcement.md

@@ -7,7 +7,7 @@ tags: ['News']
 card: true
 ---
 
-<a href="https://mui.com/r/discord"><img src="/static/blog/2023-discord-announcement/discord.png" width="1280" height="640" style="margin-bottom: 16px;" alt="Discord banner with link" /></a>
+<a href="https://mui.com/r/discord/"><img src="/static/blog/2023-discord-announcement/discord.png" width="1280" height="640" style="margin-bottom: 16px;" alt="Discord banner with link" /></a>
 
 This year, one of our highest priorities has been to create a central hub for the MUI community.
 Up until now, our community has been scattered across discussions and interactions on [Twitter](https://twitter.com/MUI_hq), [LinkedIn](https://linkedin.com/company/mui), [GitHub](https://github.com/mui), and [Stack Overflow](https://stackoverflow.com/questions/tagged/material-ui).