docs: genericize storage backend and example job types

concepts/credits.mdx

@@ -55,7 +55,7 @@ $10 / $25 / $50 / $100 (or custom, $10 minimum). Pro adds **+20%** to every purc
 
 Every job is billed in nanodollars (one-billionth of a US dollar) drawn from your prepaid balance. This differs from tier-based quotas where you buy a plan with a bucket of minutes:
 
-- **Cost matches resources used.** A 30-second watermark on 1080p shouldn't cost the same as a 10-minute H.265 transcode of a 4K master.
+- **Cost matches resources used.** A 30-second 1080p job shouldn't cost the same as a 10-minute 4K render of a large master.
 - **Prepaid means predictable budgets.** You top up when you want; jobs run only if affordable. No end-of-month surprise bill.
 
 ## Credit lifecycle

support/limits.mdx

@@ -41,15 +41,15 @@ Every limit Rendobar enforces, by plan. Pulled from `PLAN_LIMITS` in the API. Fo
 | Max batch size | 10 | 100 |
 | Max job timeout | 5 min | 15 min |
 | Output retention | 7 days | 30 days |
-| Total R2 storage | 5 GB | 250 GB |
+| Total object storage | 5 GB | 250 GB |
 | Priority queue | No | Yes |
 
 `ffmpeg`, MCP, and webhooks are on both plans.
 
 ## Output URLs
 
 - **Signed download URL** (`output.file.url`) is valid for **1 hour**. Re-fetch via `GET /jobs/{id}` for a fresh URL.
-- **Output retention**: 7 days (Free) or 30 days (Pro). After that, R2 deletes the file; the job record stays but the file URLs return 404.
+- **Output retention**: 7 days (Free) or 30 days (Pro). After that, the file is deleted; the job record stays but the file URLs return 404.
 - **Storage quota** caps total bytes across all your outputs. Delete old outputs or upgrade if you hit it.
 - **No separate per-output size limit**. Bounded by input cap and storage quota.