Docs: Fixes incorrect retrieving runs from batchTrigger (#2427)

* Docs: fix for retrieving runs in batchTrigger

* Removes old v3-to-v4 migration guide (we have a redirect)

* Corrects tag limit from 5 to 10

Author: samejr

docs/migrating-from-v3.mdx

@@ -290,7 +290,7 @@ const batchHandle = await tasks.batchTrigger([
 console.log(batchHandle.runs);
 ```
 
-In v4, you now need to use the `runs.list()` method to get the list of runs:
+In v4, you now need to use the `batch.retrieve()` method to get the batch with its runs:
 
 ```ts
 // In v4
@@ -299,9 +299,9 @@ const batchHandle = await tasks.batchTrigger([
   [myOtherTask, { baz: "qux" }],
 ]);
 
-// Now you need to call runs.list()
-const runs = await batchHandle.runs.list();
-console.log(runs);
+// Now you need to retrieve the batch to get the runs
+const batch = await batch.retrieve(batchHandle.batchId);
+console.log(batch.runs);
 ```
 
 ### OpenTelemetry

docs/snippets/migrate-v4-using-ai.mdx

@@ -200,8 +200,8 @@ const batchHandle = await tasks.batchTrigger([
   [myOtherTask, { baz: "qux" }],
 ]);
 
-const runs = await batchHandle.runs.list(); // Use runs.list()
-console.log(runs);
+const batch = await batch.retrieve(batchHandle.batchId); // Use batch.retrieve()
+console.log(batch.runs);
 
 
 Can you help me convert the following code from v3 to v4? Please include the full converted code in the answer, do not truncate it anywhere.

docs/tags.mdx

@@ -75,7 +75,7 @@ export const myTask = task({
 });
 ```
 
-Reminder: you can only have up to 5 tags per run. If you call `tags.add()` and the total number of tags will be more than 5 we log an error and ignore the new tags. That includes tags from triggering and from inside the run function.
+Reminder: you can only have up to 10 tags per run. If you call `tags.add()` and the total number of tags will be more than 10 we log an error and ignore the new tags. That includes tags from triggering and from inside the run function.
 
 ### Propagating tags to child runs