Improve documentation of Presto Resource Groups

presto-docs/src/main/sphinx/admin/resource-groups-example1.sql

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+--This script first creates a database named presto_resource_groups and then
+--creates the resource_groups_global_properties, resource_groups, and selectors tables within that database.
+--It then inserts some example data into these tables.
+
+--Please remember to replace 'user' with the actual username in your environment.
+-- Also note that this is a simple example and may not cover all your use cases.
+-- Always refer to the official PrestoDB documentation for the most accurate and up-to-date information.
+CREATE DATABASE IF NOT EXISTS presto_resource_groups;
+USE presto_resource_groups;
+
+CREATE TABLE IF NOT EXISTS resource_groups_global_properties (
+    name VARCHAR(128) NOT NULL PRIMARY KEY,
+    value VARCHAR(512) NOT NULL,
+    UNIQUE (name)
+    );
+
+INSERT INTO resource_groups_global_properties (name, value)
+VALUES ('cpu_quota_period', '1h');
+
+CREATE TABLE IF NOT EXISTS resource_groups (
+                                               id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                                               name VARCHAR(128) NOT NULL,
+    soft_memory_limit VARCHAR(128) NOT NULL,
+    hard_concurrency_limit INT NOT NULL,
+    max_queued INT NOT NULL,
+    jmx_export BOOLEAN NOT NULL,
+    soft_cpu_limit VARCHAR(128),
+    hard_cpu_limit VARCHAR(128),
+    scheduling_policy VARCHAR(128),
+    scheduling_weight INT,
+    parent_id BIGINT,
+    environment VARCHAR(128),
+    UNIQUE (name, environment)
+    );
+
+INSERT INTO resource_groups (name, soft_memory_limit, hard_concurrency_limit, max_queued, jmx_export)
+VALUES ('global', '80%', 100, 1000, true);
+
+INSERT INTO resource_groups (name, soft_memory_limit, hard_concurrency_limit, max_queued, jmx_export, parent_id)
+VALUES ('user', '50%', 50, 500, false, LAST_INSERT_ID());
+
+CREATE TABLE IF NOT EXISTS selectors (
+                                         id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                                         resource_group_id BIGINT NOT NULL,
+                                         user_regex VARCHAR(512),
+    source_regex VARCHAR(512),
+    query_type VARCHAR(512),
+    priority INT NOT NULL,
+    UNIQUE (resource_group_id, priority)
+    );
+
+INSERT INTO selectors (resource_group_id, user_regex, priority)
+VALUES (LAST_INSERT_ID(), 'user', 1);