Add Aegis to CODEOWNERS (#17902)

Author: RebeccaTamachiro

.github/CODEOWNERS

@@ -68,6 +68,7 @@
 
 # Core platform
 
+/src/content/docs/aegis/ @RebeccaTamachiro @cloudflare/pcx-technical-writing
 /src/content/docs/byoip/ @RebeccaTamachiro @cloudflare/pcx-technical-writing
 /src/content/docs/china-network/ @pedrosousa @cloudflare/pcx-technical-writing
 /src/content/docs/cloudflare-for-platforms/cloudflare-for-saas/ @RebeccaTamachiro @cloudflare/pcx-technical-writing