fix: correct line highlight numbers in OpenAPI servers example (#5302)

Co-authored-by: fern-api[bot] <115122769+fern-api[bot]@users.noreply.github.com>

Author: fern-api[bot]

fern/products/api-def/openapi/servers.mdx

@@ -23,7 +23,7 @@ Specifying servers is valuable for both SDKs and Docs:
 If you have more than one server, we recommend specifying an `x-fern-server-name` to name 
 the server. 
 
-```yml openapi.yml {3,5}
+```yml openapi.yml {2,4}
 servers: 
   - x-fern-server-name: Production
     url: https://api.yourcompany.com/
@@ -40,7 +40,7 @@ of your endpoints might be hosted at `api.yourcompany.com`.
 To specify this, you will need to add configuration to both your `generators.yml` and OpenAPI spec. The 
 snippet directly below shows how to configure an environment with multiple urls in your `generators.yml`. 
 
-```yml generators.yml {3-8}
+```yml generators.yml {6-7}
 api: 
   default-environment: Production
   default-url: api
@@ -66,7 +66,7 @@ paths:
 If you have multiple environments like development or staging, you can model those in your `generators.yml` 
 as well. 
 
-```yml generators.yml {7-12}
+```yml generators.yml {8-13}
 api: 
   default-environment: Production
   default-url: api