Replace uses of port 5000 with 5123 in documentation

Signed-off-by: Chris Sinjakli <[email protected]>

Author: Sinjo

README.md

@@ -60,7 +60,7 @@ run ->(_) { [200, {'content-type' => 'text/html'}, ['OK']] }
 ```
 
 Start the server and have a look at the metrics endpoint:
-[http://localhost:5000/metrics](http://localhost:5000/metrics).
+[http://localhost:5123/metrics](http://localhost:5123/metrics).
 
 For further instructions and other scripts to get started, have a look at the
 integrated [example application](examples/rack/README.md).

examples/rack/README.md

@@ -33,8 +33,8 @@ bundle install
 bundle exec unicorn -c ./unicorn.conf
 ```
 
-You can now open the [example app](http://localhost:5000/) and its [metrics
-page](http://localhost:5000/metrics) to inspect the output. The running
+You can now open the [example app](http://localhost:5123/) and its [metrics
+page](http://localhost:5123/metrics) to inspect the output. The running
 Prometheus server can be used to [play around with the metrics][rate-query].
 
 [rate-query]: http://localhost:9090/graph#%5B%7B%22range_input%22%3A%221h%22%2C%22expr%22%3A%22rate(http_server_requests_total%5B1m%5D)%22%2C%22tab%22%3A0%7D%5D