fix(docs/op-stack): Cosmetic

docs/op-stack/src/README.md

@@ -5,7 +5,7 @@ lang: en-US
 
 **The OP Stack is the standardized, shared, and open-source development stack that powers Optimism, maintained by the Optimism Collective.**
 
-::: tip
+::: tip Staying up to date
 
 [Stay up to date on The Superchain and the OP Stack by subscribing to the Optimism newsletter](https://optimism.us6.list-manage.com/subscribe/post?u=9727fa8bec4011400e57cafcb&id=ca91042234&f_id=002a19e3f0).
 

docs/op-stack/src/docs/releases/bedrock/explainer.md

@@ -8,7 +8,7 @@ meta:
 
 ![Bedrock](https://dev.optimism.io/content/images/size/w2000/2022/12/bedrock-BLUE.jpg)
 
-::: tip
+::: tip Staying up to date
 
 [Stay up to date on The Superchain and the OP Stack by subscribing to the Optimism newsletter](https://optimism.us6.list-manage.com/subscribe/post?u=9727fa8bec4011400e57cafcb&id=ca91042234&f_id=002a19e3f0).
 

docs/op-stack/src/docs/understand/explainer.md

@@ -15,7 +15,7 @@ meta:
   content: summary_large_image
 ---
 
-::: tip
+::: tip Staying up to date
 
 [Stay up to date on The Superchain and the OP Stack by subscribing to the Optimism newsletter](https://optimism.us6.list-manage.com/subscribe/post?u=9727fa8bec4011400e57cafcb&id=ca91042234&f_id=002a19e3f0).