Fix NGF header link (#295)

A header link was not written correctly and didn't actually link to the section.

Author: sjberman

content/ngf/how-to/data-plane-configuration.md

@@ -15,7 +15,7 @@ NGINX Gateway Fabric can dynamically update the global data plane configuration
 
 The data plane configuration is stored in the NginxProxy custom resource, which is a cluster-scoped resource that is attached to the `nginx` GatewayClass.
 
-By default, the NginxProxy resource is not created when installing NGINX Gateway Fabric. However, you can set configuration options in the `nginx.config` Helm values, and the resource will be created and attached when NGINX Gateway Fabric is installed using Helm. You can also [manually create and attach](#manually-creating-the-configuration) the resource after NGINX Gateway Fabric is already installed.
+By default, the NginxProxy resource is not created when installing NGINX Gateway Fabric. However, you can set configuration options in the `nginx.config` Helm values, and the resource will be created and attached when NGINX Gateway Fabric is installed using Helm. You can also [manually create and attach](#manually-create-the-configuration) the resource after NGINX Gateway Fabric is already installed.
 
 When installed using the Helm chart, the NginxProxy resource is named `<release-name>-proxy-config`.