Added Azure example for sql_global_config (#1028)

Author: edurdevic

docs/resources/sql_global_config.md

@@ -7,6 +7,8 @@ This resource configures the security policy, [databricks_instance_profile](inst
 
 ## Example usage
 
+### AWS example
+
 ```hcl
 resource "databricks_sql_global_config" "this" {
   security_policy      = "DATA_ACCESS_CONTROL"
@@ -17,13 +19,31 @@ resource "databricks_sql_global_config" "this" {
 }
 ```
 
+### Azure example
+
+For Azure you should use the `data_access_config` to provide the service principal configuration. You can use the Databricks SQL Admin Console UI to help you generate the right configuration values.
+
+```hcl
+resource "databricks_sql_global_config" "this" {
+  security_policy      = "DATA_ACCESS_CONTROL"
+  data_access_config = {
+    "spark.hadoop.fs.azure.account.auth.type" : "OAuth",
+    "spark.hadoop.fs.azure.account.oauth.provider.type" : "org.apache.hadoop.fs.azurebfs.oauth2.ClientCredsTokenProvider",
+    "spark.hadoop.fs.azure.account.oauth2.client.id" : "${var.tenant_id}",
+    "spark.hadoop.fs.azure.account.oauth2.client.secret" : "{{secrets/${local.secret_scope}/${local.secret_key}}}",
+    "spark.hadoop.fs.azure.account.oauth2.client.endpoint" : "https://login.microsoftonline.com/${var.tenant_id}/oauth2/token"
+  }
+}
+```
+
+
 ## Argument Reference
 
 The following arguments are supported (see [documentation](https://docs.databricks.com/sql/api/sql-endpoints.html#global-edit) for more details):
 
 * `security_policy` (Optional, String) - The policy for controlling access to datasets. Default value: `DATA_ACCESS_CONTROL`, consult documentation for list of possible values
 * `data_access_config` (Optional, Map) - data access configuration for [databricks_sql_endpoint](sql_endpoint.md), such as configuration for an external Hive metastore, Hadoop Filesystem configuration, etc.  Please note that the list of supported configuration properties is limited, so refer to the [documentation](https://docs.databricks.com/sql/admin/data-access-configuration.html#supported-properties) for a full list.  Apply will fail if you're specifying not permitted configuration.
-* `instance_profile_arn` (Optional, String) - [databricks_instance_profile](instance_profile.md) used to access storage from [databricks_sql_endpoint](sql_endpoint.md). Please note that this parameter is only for AWS, and will generate an error if used on other clouds.
+* `instance_profile_arn` (Optional, String) - [databricks_instance_profile](instance_profile.md) used to access storage from [databricks_sql_endpoint](sql_endpoint.md). Please note that this parameter is only for AWS, and will generate an error if used on other clouds. 
 
 ## Import