docs: use @trigger.dev/sdk without /v3 in run-usage examples

Update the import paths to use @trigger.dev/sdk instead of
@trigger.dev/sdk/v3 for consistency with other docs examples.

Author: claude

docs/run-usage.mdx

@@ -8,7 +8,7 @@ description: "Get compute duration and cost from inside a run, or for a specific
 You can get the cost and duration of the current including retries of the same run.
 
 ```ts
-import { task, usage, wait } from "@trigger.dev/sdk/v3";
+import { task, usage, wait } from "@trigger.dev/sdk";
 
 export const heavyTask = task({
   id: "heavy-task",
@@ -89,7 +89,7 @@ console.log("Total cost", totalCost);
 You can also wrap code with `usage.measure` to get the cost and duration of that block of code:
 
 ```ts
-import { usage, logger } from "@trigger.dev/sdk/v3";
+import { usage, logger } from "@trigger.dev/sdk";
 
 // Inside a task run function, or inside a function that's called from there.
 const { result, compute } = await usage.measure(async () => {