update docs

Author: mmichaelb

docs/resources/group.md

@@ -41,6 +41,8 @@ resource "redshift_group" "staff" {
 
 Import is supported using the following syntax:
 
+The [`terraform import` command](https://developer.hashicorp.com/terraform/cli/commands/import) can be used, for example:
+
 ```shell
 # Import group with grosysid: SELECT grosysid FROM pg_group WHERE groname = 'mygroup'
 

docs/resources/schema.md

@@ -279,6 +279,8 @@ Optional:
 
 Import is supported using the following syntax:
 
+The [`terraform import` command](https://developer.hashicorp.com/terraform/cli/commands/import) can be used, for example:
+
 ```shell
 # Import schema with oid: SELECT oid FROM pg_catalog.pg_namespace WHERE nspname = 'myschema';
 

docs/resources/user.md

@@ -50,6 +50,8 @@ resource "redshift_user" "user_with_unrestricted_syslog" {
 
 Import is supported using the following syntax:
 
+The [`terraform import` command](https://developer.hashicorp.com/terraform/cli/commands/import) can be used, for example:
+
 ```shell
 # Import user with usesysid: SELECT usesysid FROM pg_user_info WHERE usename = 'mememe'