Licensing: Document new v7.4 options and APIs (#30217)

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/http_api/licensing.md

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+title = "Licensing HTTP API "
+description = "Grafana Licensing HTTP API"
+keywords = ["grafana", "http", "documentation", "api", "licensing", "enterprise"]
+aliases = ["/docs/grafana/latest/http_api/licensing/"]
++++
+
+> Licensing is only available in Grafana Enterprise. Read more about [Grafana Enterprise]({{< relref "../enterprise" >}}).
+
+## Manually force license refresh
+
+> **Note:** Available in Grafana Enterprise v7.4+.
+
+`POST /api/licensing/token/renew`
+
+Manually ask license issuer for a new token.
+
+**Example request:**
+
+```http
+POST /api/licensing/token/renew
+Accept: application/json
+Content-Type: application/json
+Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
+
+{}
+```
+
+**Example response:**
+
+```http
+HTTP/1.1 200 OK
+Content-Type: application/json
+Content-Length: 357
+
+{
+  "jti":"2",
+  "iss":"https://grafana.com",
+  "sub":"https://play.grafana.org/"
+  "lid":"1",
+  "included_admins":5,
+  "included_viewers":10,
+  "lic_exp_warn_days":30,
+  "tok_exp_warn_days":2,
+  "update_days":1,
+  "prod":["grafana-enterprise"],
+  "company":"Grafana Labs"
+}
+```
+
+The response is a JSON blob available for debugging purposes. The
+available fields may change at any time without any prior notice.
+
+Status Codes:
+
+- **200** - OK
+- **401** - Unauthorized
+- **403** - Access denied
+
+## Remove license from database
+
+> **Note:** Available in Grafana Enterprise v7.4+.
+
+`DELETE /api/licensing/token`
+
+Removes the license stored in the Grafana database.
+
+**Example request:**
+
+```http
+DELETE /api/licensing/token
+Accept: application/json
+Content-Type: application/json
+Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
+
+{"instance": "http://play.grafana.org/"}
+```
+
+JSON Body schema:
+
+- **instance** – Root URL for the instance for which the license should be deleted. Required.
+
+**Example response:**
+
+```http
+HTTP/1.1 202 Accepted
+Content-Type: application/json
+Content-Length: 2
+
+{}
+```
+
+Status codes:
+
+- **202** - Accepted, license removed or did not exist.
+- **401** - Unauthorized
+- **403** - Access denied
+- **422** - Unprocessable entity, incorrect instance name provided.