Update account-limits.mdx (#20789)

* Update account-limits.mdx

With this commit, a DNS location cannot have more than 1500 source ipv4
networks assigned to it. Users will get a 400 - Bad Request status
response when attempting to create/update a location exceeding that
limit.

https://gitlab.cfdata.org/cloudflare/ares/access-resolver-account-service/-/merge_requests/2657

* Update src/content/docs/cloudflare-one/account-limits.mdx

---------

Co-authored-by: Max Phillips <[email protected]>

Author: NuelEdeh

src/content/docs/cloudflare-one/account-limits.mdx

@@ -35,6 +35,7 @@ This page lists the default account limits for rules, applications, fields, and
 | Egress policies per account               | 500   |
 | Resolver policies per account             | 500   |
 | DNS locations                             | 250   |
+| Source IP CIDRs per DNS location          | 1,500 |
 | Concurrent streams for HTTP/2 connections | 256   |
 | Proxy endpoints                           | 500   |
 | Source IP CIDRs per proxy endpoint        | 2,000 |