fix(404): Update DSN-explainer links in code snippets (#12312)

Author: chargome

platform-includes/configuration/config-intro/dotnet.mdx

@@ -5,7 +5,7 @@ For example, initialize with `SentrySdk.Init` in your `Program.cs` file:
 SentrySdk.Init(options =>
 {
     // A Sentry Data Source Name (DSN) is required.
-    // See https://docs.sentry.io/product/sentry-basics/dsn-explainer/
+    // See https://docs.sentry.io/concepts/key-terms/dsn-explainer/
     // You can set it in the SENTRY_DSN environment variable, or you can set it in code here.
     options.Dsn = "___PUBLIC_DSN___";
 

platform-includes/configuration/config-intro/powershell.mdx

@@ -4,7 +4,7 @@ For example, initialize with `Start-Sentry` in your PowerShell script:
 ```powershell
 Start-Sentry {
     # A Sentry Data Source Name (DSN) is required.
-    # See https://docs.sentry.io/product/sentry-basics/dsn-explainer/
+    # See https://docs.sentry.io/concepts/key-terms/dsn-explainer/
     # You can set it in the SENTRY_DSN environment variable, or you can set it in code here.
     $_.Dsn = '___PUBLIC_DSN___'
 

platform-includes/getting-started-config/dotnet.mdx

@@ -5,7 +5,7 @@ For example, initialize with `SentrySdk.Init` in your `Program.cs` file:
 SentrySdk.Init(options =>
 {
     // A Sentry Data Source Name (DSN) is required.
-    // See https://docs.sentry.io/product/sentry-basics/dsn-explainer/
+    // See https://docs.sentry.io/concepts/key-terms/dsn-explainer/
     // You can set it in the SENTRY_DSN environment variable, or you can set it in code here.
     options.Dsn = "___PUBLIC_DSN___";