Document role requirement for multi-resource metrics queries (#29241)

React to feedback in
Azure/azure-sdk-blog#479 (comment).
Also apply small changes as part of a cross-language README consistency
review.

sdk/monitor/monitor-query/README.md

@@ -37,7 +37,7 @@ For more information, see our [support policy](https://github.com/Azure/azure-sd
 Install the Azure Monitor Query client library for JavaScript with npm:
 
 ```bash
-npm install @azure/monitor-query
+npm install --save @azure/monitor-query
 ```
 
 ### Create the client
@@ -113,6 +113,8 @@ Each set of metric values is a time series with the following characteristics:
 - [Advanced logs query scenarios](#advanced-logs-query-scenarios)
   - [Set logs query timeout](#set-logs-query-timeout)
   - [Query multiple workspaces](#query-multiple-workspaces)
+  - [Include statistics](#include-statistics)
+  - [Include visualization](#include-visualization)
 - [Metrics query](#metrics-query)
   - [Handle metrics query response](#handle-metrics-query-response)
   - [Example of handling response](#example-of-handling-response)
@@ -122,7 +124,7 @@ Each set of metric values is a time series with the following characteristics:
 
 The `LogsQueryClient` can be used to query a Log Analytics workspace using the [Kusto Query Language][kusto_query_language]. The `timespan.duration` can be specified as a string in an ISO 8601 duration format. You can use the `Durations` constants provided for some commonly used ISO 8601 durations.
 
-You can query logs by workspace ID or resource ID. The result is returned as a table with a collection of rows.
+You can query logs by Log Analytics workspace ID or Azure resource ID. The result is returned as a table with a collection of rows.
 
 #### Workspace-centric logs query
 
@@ -841,7 +843,10 @@ Each Azure resource must reside in:
 - The same region as the endpoint specified when creating the client.
 - The same Azure subscription.
 
-Furthermore, the metric namespace containing the metrics to be queried must be provided. For a list of metric namespaces, see [Supported metrics and log categories by resource type][metric_namespaces].
+Furthermore:
+
+- The user must be authorized to read monitoring data at the Azure subscription level. For example, the [Monitoring Reader role](https://learn.microsoft.com/azure/role-based-access-control/built-in-roles/monitor#monitoring-reader) on the subscription to be queried.
+- The metric namespace containing the metrics to be queried must be provided. For a list of metric namespaces, see [Supported metrics and log categories by resource type][metric_namespaces].
 
 ```ts
 let resourceIds: string[] = [