Add APPLY_TAG privilege to Volume grants docs (#4928)

## Changes
Clarify in the docs that APPLY_TAG is supported for Volume grant
privilege.

## Tests
Checked that APPLY_TAG is supported.

- [ ] `make test` run locally
- [x] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] using Go SDK
- [ ] using TF Plugin Framework
- [ ] has entry in `NEXT_CHANGELOG.md` file

NO_CHANGELOG=true

---------

Co-authored-by: Alex Ott <[email protected]>

Author: kanterov

NEXT_CHANGELOG.md

@@ -14,6 +14,7 @@
 
 * Document `email_notifications` block in model serving resources ([#4910](https://github.com/databricks/terraform-provider-databricks/pull/4910))
 * Deprecate `databricks_sql_visualization` and `databricks_sql_widget` resource. ([#4924](https://github.com/databricks/terraform-provider-databricks/pull/4924))
+* Document `APPLY_TAG` privilege for `databricks_volume` grants ([#4928](https://github.com/databricks/terraform-provider-databricks/pull/4928))
 
 ### Exporter
 

docs/resources/grants.md

@@ -169,7 +169,7 @@ resource "databricks_grants" "customers" {
 
 ## Volume grants
 
-You can grant `ALL_PRIVILEGES`, `MANAGE`, `READ_VOLUME` and `WRITE_VOLUME` privileges to [_`catalog.schema.volume`_](volume.md) specified in the `volume` attribute.
+You can grant `ALL_PRIVILEGES`, `APPLY_TAG`, `MANAGE`, `READ_VOLUME` and `WRITE_VOLUME` privileges to [_`catalog.schema.volume`_](volume.md) specified in the `volume` attribute.
 
 ```hcl
 resource "databricks_volume" "this" {