update containers max_instances default to 20

Author: emily-shen

src/content/docs/workers/wrangler/configuration.mdx

@@ -993,10 +993,10 @@ The following options are available:
 
 - `max_instances` <Type text="string" /> <MetaInfo text="optional" />
   - The maximum number of concurrent container instances you want to run. If you have more Durable Objects that
-    request to run a container than this number, the container request will error. You may have more Durable Objects
-    than this number over a longer time period, but you may not have more concurrently.
+    request to run a container than this number, the container request will error. Stopped containers do not count towards this -
+    you may have more containers than this number overall, but only this many active containers at once.
 
-	- Defaults to 1. 
+  - Defaults to 20.
 
   - This value is only enforced when running in production on Cloudflare's network. This limit does not apply during local development, so you may run more instances than specified.
 
@@ -1403,12 +1403,13 @@ A common example of using a redirected configuration is where a custom build too
   It also creates a `.wrangler/deploy/config.json` file that redirects Wrangler to the new, generated deployment configuration file:
 
   <FileTree>
-  - dist
-    - index.js
-    - wrangler.jsonc
-  - .wrangler
-    - deploy
-      - config.json
+
+- dist
+  - index.js
+  - wrangler.jsonc
+- .wrangler
+  - deploy
+    - config.json
 
   </FileTree>