fix: Update mgmt usage report interval (#850)

Author: vepatel

content/nic/installation/installing-nic/installation-with-helm.md

@@ -308,7 +308,7 @@ The following tables lists the configurable parameters of the NGINX Ingress Cont
 | **controller.mgmt.licenseTokenSecretName** | Configures the secret used in the [license_token](https://nginx.org/en/docs/ngx_mgmt_module.html#license_token) directive. This key assumes the secret is in the Namespace that NGINX Ingress Controller is deployed in. The secret must be of type `nginx.com/license` with the base64 encoded JWT in the `license.jwt` key. | license-token |
 | **controller.mgmt.enforceInitialReport** | Configures the [enforce_initial_report](https://nginx.org/en/docs/ngx_mgmt_module.html#enforce_initial_report) directive, which enables or disables the 180-day grace period for sending the initial usage report. | false |
 | **controller.mgmt.usageReport.endpoint** | Configures the endpoint of the [usage_report](https://nginx.org/en/docs/ngx_mgmt_module.html#usage_report) directive. This is used to configure the endpoint NGINX uses to send usage reports to NIM. | product.connect.nginx.com |
-| **controller.mgmt.usageReport.interval** | Configures the interval of the [usage_report](https://nginx.org/en/docs/ngx_mgmt_module.html#usage_report) directive. This specifies the frequency that usage reports are sent. This field takes an [NGINX time](https://nginx.org/en/docs/syntax.html). | 1h |
+| **controller.mgmt.usageReport.interval** | Configures the interval of the [usage_report](https://nginx.org/en/docs/ngx_mgmt_module.html#usage_report) directive. This specifies the frequency that usage reports are sent. Only seconds(s), minutes(m), and hours(h) are allowed and must be between 60s and 24h. | 1h |
 | **controller.mgmt.usageReport.proxyHost** | Configures the host name of the [proxy](https://nginx.org/en/docs/ngx_mgmt_module.html#proxy) directive with optional port. | N/A |
 | **controller.mgmt.usageReport.proxyCredentialsSecretName** | Configures the [proxy_username](https://nginx.org/en/docs/ngx_mgmt_module.html#proxy_username) directive as well as the [proxy_password](https://nginx.org/en/docs/ngx_mgmt_module.html#proxy_password) directive using a Kubernetes Opaque Secret. The Secret must contain `username` and `password` fields. | N/A |
 | **controller.mgmt.sslVerify** | Configures the [ssl_verify](https://nginx.org/en/docs/ngx_mgmt_module.html#ssl_verify) directive, which enables or disables verification of the usage reporting endpoint certificate.  | true |