Improve Monitor Query NuGet package description (Azure#23714)

Author: scottaddie

sdk/monitor/Azure.Monitor.Query/src/Azure.Monitor.Query.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <Description>This library allows querying logs and metrics from the Azure Monitor service.</Description>
+    <Description>A library for querying Azure Monitor's Logs and Metrics data sources.</Description>
     <AssemblyTitle>Azure Monitor Query client library</AssemblyTitle>
     <Version>1.0.0-beta.4</Version>
     <PackageTags>Azure Monitor Query</PackageTags>