style(database): fix gofmt comment indentation in concurrent_test.go

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

database/concurrent_test.go

@@ -24,6 +24,7 @@ import (
 //     occur at all.
 //
 // Chain of proof:
+//
 //	TestConcurrentWrites/with_fix_* proves SetMaxOpenConns(1) fixes the bug.
 //	TestInitDBConcurrencyConfig/single_connection_pool proves InitDB calls it.
 //	Therefore InitDB fixes the bug.
@@ -63,10 +64,12 @@ func TestInitDBConcurrencyConfig(t *testing.T) {
 // The ONLY variable that differs between the two sub-tests is MaxOpenConns.
 //
 // Without fix (MaxOpenConns=2):
+//
 //	conn1 acquires the SQLite write lock; conn2 is a separate connection that
 //	immediately tries to write and fails because it cannot wait out the lock.
 //
 // With fix (MaxOpenConns=1):
+//
 //	conn2 cannot be acquired from the pool while conn1 is in use, so it
 //	blocks at the Go pool level instead of racing at the SQLite level.
 //	Once conn1 is released, conn2 gets the connection and writes without error.