[TA] Enable multiversion (Azure#21353)

Author: maririos

sdk/textanalytics/Azure.AI.TextAnalytics/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## 5.1.0-beta.8 (Unreleased)
 ### New features
+- Added support for service version `3.0`. This can be specified in the `TextAnalyticsClientOptions` object under the `ServiceVersion` enum. By default the SDK targets latest supported service version.
 - Added value `None` to enum `PiiEntityDomainType` to allow user to specify no domain.
 
 ### Breaking changes

sdk/textanalytics/Azure.AI.TextAnalytics/README.md

@@ -19,6 +19,15 @@ Install the Azure Text Analytics client library for .NET with [NuGet][nuget]:
 ```PowerShell
 dotnet add package Azure.AI.TextAnalytics
 ```
+> Note: This version of the client library defaults to the `v3.1-preview.5` version of the service.
+
+This table shows the relationship between SDK versions and supported API versions of the service:
+
+|SDK version|Supported API version of service
+|-|- |
+|5.1.0-beta.7 (latest Beta) | 3.0, 3.1-preview.5
+|5.0.0 (latest GA) | 3.0
+|1.0.0, 1.0.1 | 3.0
 
 ### Prerequisites
 * An [Azure subscription][azure_sub].

sdk/textanalytics/Azure.AI.TextAnalytics/src/AnalyzeSentimentOptions.cs

@@ -32,6 +32,9 @@ internal AnalyzeSentimentOptions(TextAnalyticsRequestOptions options)
         /// will contain the result of this analysis.
         /// <para>Only available for service version v3.1-preview and up.</para>
         /// </summary>
+        /// <remarks>
+        /// This property only has value for <see cref="TextAnalyticsClientOptions.ServiceVersion.V3_1_Preview_5"/> and up.
+        /// </remarks>
         public bool? IncludeOpinionMining { get; set; }
     }
 }

sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/TextAnalyticsRestClient.cs

@@ -62,8 +62,10 @@ internal LinkedEntity(string name, IEnumerable<LinkedEntityMatch> matches, strin
 
         /// <summary> Bing Entity Search API unique identifier of the recognized entity.
         /// Use in conjunction with the Bing Entity Search API to fetch additional relevant information.
-        /// This property is only available for service v3.1-preview and up.
         /// </summary>
+        /// <remarks>
+        /// This property only has value for <see cref="TextAnalyticsClientOptions.ServiceVersion.V3_1_Preview_5"/> and up.
+        /// </remarks>
         [CodeGenMember("BingId")]
         public string BingEntitySearchApiId { get; }
     }