guides: fix port in .net guide (#22269)

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## Description

The default port changed from 80 to 8080 when we switched to a newer
version of .net in #21877.

https://learn.microsoft.com/en-us/dotnet/core/compatibility/containers/8.0/aspnet-port


https://deploy-preview-22269--docsdocker.netlify.app/guides/dotnet/develop/

https://deploy-preview-22269--docsdocker.netlify.app/guides/dotnet/deploy/

## Related issues or tickets

Closes #22265
Related to #22080
ENGDOCS-2492

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Technical review

---------

Signed-off-by: Craig <craig.osterhout@docker.com>

content/guides/dotnet/deploy.md

@@ -64,7 +64,7 @@ spec:
           name: server
           imagePullPolicy: Always
           ports:
-            - containerPort: 80
+            - containerPort: 8080
               hostPort: 8080
               protocol: TCP
           resources: {}
@@ -117,7 +117,7 @@ spec:
   ports:
     - name: "8080"
       port: 8080
-      targetPort: 80
+      targetPort: 8080
       nodePort: 30001
   selector:
     service: server

content/guides/dotnet/develop.md

@@ -182,9 +182,9 @@ $ docker container ls
 You should see output like the following.
 
 ```console
-CONTAINER ID   IMAGE                  COMMAND                  CREATED              STATUS                        PORTS                  NAMES
-cb36e310aa7e   docker-dotnet-server   "dotnet myWebApp.dll"    About a minute ago   Up About a minute             0.0.0.0:8080->80/tcp   docker-dotnet-server-1
-39fdcf0aff7b   postgres               "docker-entrypoint.s…"   About a minute ago   Up About a minute (healthy)   5432/tcp               docker-dotnet-db-1
+CONTAINER ID   IMAGE                  COMMAND                  CREATED              STATUS                        PORTS                    NAMES
+cb36e310aa7e   docker-dotnet-server   "dotnet myWebApp.dll"    About a minute ago   Up About a minute             0.0.0.0:8080->8080/tcp   docker-dotnet-server-1
+39fdcf0aff7b   postgres               "docker-entrypoint.s…"   About a minute ago   Up About a minute (healthy)   5432/tcp                 docker-dotnet-db-1
 ```
 
 In the previous example, the container ID is `39fdcf0aff7b`. Run the following command to connect to the postgres database in the container. Replace the container ID with your own container ID.
@@ -241,7 +241,7 @@ services:
       context: .
       target: final
     ports:
-      - 8080:80
+      - 8080:8080
     depends_on:
       db:
         condition: service_healthy
@@ -337,14 +337,14 @@ ENTRYPOINT ["dotnet", "myWebApp.dll"]
 
 The following is the updated `compose.yaml` file.
 
-```yaml {hl_lines="5"}
+```yaml {hl_lines=[5,15,16]}
 services:
   server:
     build:
       context: .
       target: development
     ports:
-      - 8080:80
+      - 8080:8080
     depends_on:
       db:
         condition: service_healthy
@@ -354,7 +354,6 @@ services:
           path: .
     environment:
       - ASPNETCORE_ENVIRONMENT=Development
-      - ASPNETCORE_URLS=http://+:80'
   db:
     image: postgres
     restart: always