Replace the instructions too

Author: sander1095

aspnetcore/fundamentals/openapi/aspnetcore-openapi.md

@@ -164,7 +164,7 @@ By default, the generated OpenAPI document will be emitted to the application's
 </PropertyGroup>
 ```
 
-The value of `OpenApiDocumentsDirectory` is resolved relative to the project file. Using the `./` value above will emit the OpenAPI document in the same directory as the project file.
+The value of `OpenApiDocumentsDirectory` is resolved relative to the project file. Using the `.` value above will emit the OpenAPI document in the same directory as the project file.
 
 #### Modifying the output file name