add Implicit Usings docs (#4585)

Author: SimonCropp

src/includes/troubleshooting/dotnet.mdx

@@ -26,14 +26,27 @@ The above error could have two meanings:
 Your debug window will have following messages:
 
 ```
-  Debug: Logging enabled with ConsoleDiagnosticLogger and min level: Debug
-  Debug: Initializing Hub for Dsn: '___PUBLIC_DSN___'.
-  Debug: Using 'GzipBufferedRequestBodyHandler' body compression strategy with level Optimal.
-  Debug: New scope pushed.
-  Debug: Registering integration: 'AutoSessionTrackingIntegration'.
-  Debug: Registering integration: 'AppDomainUnhandledExceptionIntegration'.
-  Debug: Registering integration: 'AppDomainProcessExitIntegration'.
-  Debug: Registering integration: 'TaskUnobservedTaskExceptionIntegration'.
-  Debug: Registering integration: 'SentryDiagnosticListenerIntegration'.
+Debug: Logging enabled with ConsoleDiagnosticLogger and min level: Debug
+Debug: Initializing Hub for Dsn: '___PUBLIC_DSN___'.
+Debug: Using 'GzipBufferedRequestBodyHandler' body compression strategy with level Optimal.
+Debug: New scope pushed.
+Debug: Registering integration: 'AutoSessionTrackingIntegration'.
+Debug: Registering integration: 'AppDomainUnhandledExceptionIntegration'.
+Debug: Registering integration: 'AppDomainProcessExitIntegration'.
+Debug: Registering integration: 'TaskUnobservedTaskExceptionIntegration'.
+Debug: Registering integration: 'SentryDiagnosticListenerIntegration'.
 ```
 If the debug file contains information about `SentryDiagnosticListenerIntegration`, then your project already includes the integration automatically.
+
+
+### Implicit Usings
+
+From version 3.14.0, Sentry will respect [Implicit Usings](https://docs.microsoft.com/en-us/dotnet/core/project-sdk/overview#implicit-using-directives). This means is Implicit Usings is enabled (`<ImplicitUsings>enable</ImplicitUsings>` or `<ImplicitUsings>true</ImplicitUsings>`) then `Sentry` will be added to the current global using directives. This means that `using Sentry;` can be omitted from any `.cs` files.
+
+In some scenarios Implicit Usings can result in type name conflicts. For example `Session` may exist in multiple namespaces. This can be resolved by fully qualifying the type inline (`Sentry.Session`), or with a [using alias](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/using-directive#using-alias):
+
+```
+using SentrySession = Sentry.Session;
+```
+
+Then `SentrySession` can be used instead of `SentrySession`.