feat(go): Add a snippet for setting transaction name (#6647)

Author: tonyo

src/platform-includes/enriching-events/set-transaction-name/go.mdx

@@ -0,0 +1,6 @@
+```go
+transaction := sentry.TransactionFromContext(ctx)
+if transaction != nil {
+	transaction.Name = "UserListView"
+}
+```

src/platforms/common/enriching-events/transaction-name.mdx

@@ -14,6 +14,7 @@ supported:
   - dart
   - java
   - android
+  - go
 notSupported:
   - javascript.cordova
   - javascript.nextjs
@@ -50,7 +51,7 @@ To override the name of the currently running transaction:
 
 <PlatformContent includePath="enriching-events/set-transaction-name" />
 
-<PlatformSection supported={["javascript", "node", "python"]}>
+<PlatformSection supported={["javascript", "node", "python", "go"]}>
 
 Please refer to [the tracing documentation](../../performance/) for how to start and stop transactions.