fix docs module tests

resolves https://github.com/abpframework/abp/issues/3670

modules/docs/test/Volo.Docs.Application.Tests/Volo/Docs/ApplicationService_Tests.cs

@@ -28,9 +28,9 @@ namespace Volo.Docs
         [Fact]
         public async Task GetAsync()
         {
-            var project = await _projectAppService.GetAsync("ABP");
+            var project = await _projectAppService.GetAsync("abp");
             project.ShouldNotBeNull();
-            project.ShortName.ShouldBe("ABP");
+            project.ShortName.ShouldBe("abp");
         }
 
         [Fact]

modules/docs/test/Volo.Docs.TestBase/Volo/Docs/ProjectRepository_Tests.cs

@@ -27,10 +27,10 @@ namespace Volo.Docs
         [Fact]
         public async Task GetByShortNameAsync()
         {
-            var project = await ProjectRepository.GetByShortNameAsync("ABP");
+            var project = await ProjectRepository.GetByShortNameAsync("abp");
 
             project.ShouldNotBeNull();
-            project.ShortName.ShouldBe("ABP");
+            project.ShortName.ShouldBe("abp");
         }
     }
 }