[Search] Update REST commit to latest from main - b8d48bc (#25812)

* Update REST commit to latest from main

Remove outdated comments from autorest.md

* Update code generation comments in autorest.md

Update the contributing.md doc

* Add a missing article in a doc line

* Use permalink for doc link, since it is in autorest.md

Author: Mohit-Chakraborty

sdk/search/Azure.Search.Documents/api/Azure.Search.Documents.netstandard2.0.cs

@@ -1572,6 +1572,7 @@ public OcrSkill(System.Collections.Generic.IEnumerable<Azure.Search.Documents.In
         public static Azure.Search.Documents.Indexes.Models.OcrSkillLanguage SrLatn { get { throw null; } }
         public static Azure.Search.Documents.Indexes.Models.OcrSkillLanguage Sv { get { throw null; } }
         public static Azure.Search.Documents.Indexes.Models.OcrSkillLanguage Tr { get { throw null; } }
+        public static Azure.Search.Documents.Indexes.Models.OcrSkillLanguage Unk { get { throw null; } }
         public static Azure.Search.Documents.Indexes.Models.OcrSkillLanguage ZhHans { get { throw null; } }
         public static Azure.Search.Documents.Indexes.Models.OcrSkillLanguage ZhHant { get { throw null; } }
         public bool Equals(Azure.Search.Documents.Indexes.Models.OcrSkillLanguage other) { throw null; }

sdk/search/Azure.Search.Documents/src/Generated/Models/OcrSkillLanguage.cs

@@ -1,20 +1,18 @@
 # Azure.Search.Documents Code Generation
 
-Run `/sdk/search/generate.ps1` to generate code.
+Run `dotnet build /t:GenerateCode` in the `src` directory to generate SDK code.
+
+See the [Contributing guidelines](https://github.com/Azure/azure-sdk-for-net/blob/fe0bf0e7e84a406ec2102c194ea05ccd5011a141/sdk/search/CONTRIBUTING.md) for more details.
 
 ## AutoRest Configuration
 > see https://aka.ms/autorest
 
 ## Swagger Source(s)
-AutoRest doesn't play nicely with multiple remote swagger files.  It will
-however merge two local swagger files together automagically.  At some point,
-we should merge the Service and Index swagger files together but for now we
-copy them locally in `/sdk/search/generate.ps1` and reference them here.
 ```yaml
 title: SearchServiceClient
 input-file:
- - https://github.com/shmed/azure-rest-api-specs/blob/7a003b0aa0def1a454ff0844fa4c6a276bc1ee53/specification/search/data-plane/Azure.Search/preview/2021-04-30-Preview/searchindex.json
- - https://github.com/shmed/azure-rest-api-specs/blob/7a003b0aa0def1a454ff0844fa4c6a276bc1ee53/specification/search/data-plane/Azure.Search/preview/2021-04-30-Preview/searchservice.json
+ - https://github.com/Azure/azure-rest-api-specs/blob/b8d48bca1298614fdf7734c26e21a88adf5375d9/specification/search/data-plane/Azure.Search/preview/2021-04-30-Preview/searchindex.json
+ - https://github.com/Azure/azure-rest-api-specs/blob/b8d48bca1298614fdf7734c26e21a88adf5375d9/specification/search/data-plane/Azure.Search/preview/2021-04-30-Preview/searchservice.json
 modelerfour:
     seal-single-value-enum-by-default: true
 ```

sdk/search/Azure.Search.Documents/src/Generated/Models/QueryLanguage.cs

@@ -20,8 +20,8 @@ client libraries.  You can learn about these shared features in the
 
 ## Code Generation
 Please do not edit any of the code in the `/Generated` folders directly.  If
-you need to update a swagger file or change the generator, you can regenerate
-by running the `\sdk\search\generate.ps1` script.
+you need to update code in response to a swagger file change or a code generator update,
+you can regenerate the code by running `dotnet build /t:GenerateCode` in the `src` directory.
 
 ## Testing
 Please ensure all tests pass with any changes and additional tests are added to