Update errors-inbox.mdx

Bulk actions will be released to prod in a couple of days. Not sure if it should be part of the PR yet, a screenshot showing bulk actions' UI?

src/content/docs/errors-inbox/errors-inbox.mdx

@@ -102,6 +102,10 @@ Your errors inbox displays the total number of occurrences of each error group w
 
 Using the dropdown in the top right, you can sort the list of grouped errors by the number of occurrences or by the error that was last seen (latest first).
 
+### Bulk Actions 
+
+You can update the status (e.g. resolve, ignore, unresolve) of multiple error groups, up to 2,000, all at once. In the inbox view, you can select the Error group checkbox and update all error groups in the inbox. You can also select individual error groups and update their status.
+
 ## Triage errors
 
 ### Errors status