[Aegis] Clarify Workers subrequests note (#19249)

* Update workers.mdx

* Improve wording

* Minor text adjustments and link to service-bindings

* Remove link to service-bindings after checking internally

---------

Co-authored-by: Rebecca Tamachiro <[email protected]>

Author: markdembo

src/content/docs/aegis/configuration-options/workers.mdx

@@ -12,5 +12,5 @@ head:
 When paired with Aegis, whenever Cloudflare's developer platform needs to access services on your origin, it will use the dedicated IP addresses.
 
 :::note
-For Workers subrequests, it is expected that other IPs are used.
-:::
+For Workers subrequests — meaning requests from one Worker to another — it is expected that different IPs are used. However, requests to external origins made by a Worker invoked via a subrequest will use the dedicated IP addresses.
+:::