Document grafana/k6#1489 (#113)

Author: mstoykov

src/data/markdown/docs/01 guides/02 Using k6/05 Options.md

@@ -339,6 +339,8 @@ An object with overrides to DNS resolution, similar to what you can do with `/et
 Linux/Unix or `C:\\Windows\\System32\\drivers\\etc\\hosts` on Windows. For instance, you could set
 up an override which routes all requests for `test.k6.io` to `1.2.3.4`.
 
+From v0.28.0 it is also supported to redirect only from certain ports and/or to certain ports.
+
 > #### ⚠️ Keep in mind!
 >
 > This does not modify the actual HTTP `Host` header, but rather where it will be routed.
@@ -353,12 +355,16 @@ up an override which routes all requests for `test.k6.io` to `1.2.3.4`.
 export let options = {
   hosts: {
     'test.k6.io': '1.2.3.4',
+    'test.k6.io:443': '1.2.3.4:8443',
   },
 };
 ```
 
 </div>
 
+With the above code any request made to `test.k6.io` will be redirected to `1.2.3.4` without changing
+it port unless it's port is `443` which will be redirected to port `8443`.
+
 ### HTTP Debug
 
 Log all HTTP requests and responses. Excludes body by default, to include body use