fix-typo

Author: rekby

ydb/docs/en/core/dev/example-app/go/index.md

@@ -77,7 +77,7 @@ YQL queries are executed within special objects called `query.Session`. Sessions
 The query service client provides an API for executing queries:
 
 * `db.Query().Do(ctx, op)` creates sessions in the background and automatically retries the provided `op func(ctx context.Context, s query.Session) error` operation if necessary. As soon as a session is ready, it is passed to the callback.
-* `db.Query().DoTx(ctx, op)` automatically handles transaction lifecycle. It provides a prepared transaction object `query.TxActor` to the user-defined function `op func(ctx context.Context, tx query.TxActor)` error. If the operation returns without error (nil), the transaction will commit automatically. If it returns any error, the transaction will rollback automatically.
+* `db.Query().DoTx(ctx, op)` automatically handles transaction lifecycle. It provides a prepared transaction object `query.TxActor` to the user-defined function `op func(ctx context.Context, tx query.TxActor) error`. If the operation returns without error (nil), the transaction will commit automatically. If it returns any error, the transaction will rollback automatically.
 * `db.Query().Exec` is used to run a single query that returns **no result**, with automatic retry logic on failure. This method returns nil if the execution was successful, or an error otherwise.
 * `db.Query().Query` executes a single query containing one or more statements that return a result. It automatically handles retries. Upon successful execution, it returns a fully materialized result (`query.Result`). All result rows are loaded into memory and available for immediate iteration. For queries returning large datasets, this may lead to an [Out of memory](https://en.wikipedia.org/wiki/Out_of_memory) problem.
 * `db.Query().QueryResultSet` executes a query that contains exactly one statement returning results (it may contain other auxiliary statements that return no results, e.g. `UPSERT`). Like `db.Query().Query`, it automatically retries failed operations and returns a fully materialized result set (`query.ResultSet`). Queries that return large datasets may cause an [OOM](https://en.wikipedia.org/wiki/Out_of_memory) error.