Fix minor typos in exercises (#7)

Co-authored-by: Kent C. Dodds <[email protected]>

Author: pnadalini

exercises/03.sampling/01.problem.simple/README.mdx

@@ -67,7 +67,7 @@ The `maxTokens` option references the max tokens the model should return.
 
 <callout-warning>
 	The `system prompt` + `messages` + `OUTPUT MESSAGE` can't exceed the context
-	window size of the model you're user is using.
+	window size of the model your user is using.
 </callout-warning>
 
 Here's an example of how to send a notification:

exercises/05.changes/03.problem.subscriptions/README.mdx

@@ -2,7 +2,7 @@
 
 <EpicVideo url="https://www.epicai.pro/workshops/day-3-4-advanced-mcp-features/subscriptions~hja2q" />
 
-👨‍💼 When people use our EpicMe journaling MCP, they want the LLM they're using to always have the latest version of their jounraling data. Exposing subscriptions for resources (like a particular entry, tag, or video) allows clients to be notified of changes to specific resources the LLM is using in its context or the client may be using for other purposes.
+👨‍💼 When people use our EpicMe journaling MCP, they want the LLM they're using to always have the latest version of their journaling data. Exposing subscriptions for resources (like a particular entry, tag, or video) allows clients to be notified of changes to specific resources the LLM is using in its context or the client may be using for other purposes.
 
 To make this possible, our MCP server needs to support **resource subscriptions**. This means clients can subscribe to updates for specific resources, and the server will notify them when those resources change.