Apply suggestions from code review

Co-authored-by: Alex Popov <sasho.popov@toptal.com>

README.md

@@ -1146,12 +1146,12 @@ rake chewy:journal:apply["$(date -v-1H -u +%FT%TZ)"] # apply journaled changes f
 rake chewy:journal:apply["$(date -v-1H -u +%FT%TZ)",users] # apply journaled changes for the past hour on UsersIndex only
 ```
 
-For the cases when journal has grown up to enormous size, classical way of deletion is not quite possible. Fortunately chewy internally uses [delete-by-query](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/docs-delete-by-query.html#docs-delete-by-query-task-api) ES function which support async execution with batching and [throttling](https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-delete-by-query.html#docs-delete-by-query-throttle).
+When the size of the journal becomes very large, the classical way of deletion is not possible. Fortunately, Chewy internally uses [delete-by-query](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/docs-delete-by-query.html#docs-delete-by-query-task-api) ES function which supports async execution with batching and [throttling](https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-delete-by-query.html#docs-delete-by-query-throttle).
 
-Available options are listed below, they can by set by ENV variables:
-* `WAIT_FOR_COMPLETION` - boolean flag, options controls async execution, It waits by default, when set to `false`, Elasticsearch performs some preflight checks, launches the request, and returns a task you can use to cancel or get the status of the task
-* `REQUESTS_PER_SECOND` - float, The throttle for this request in sub-requests per second
-* `SCROLL_SIZE` - integer, Size of the scroll request that powers the operation
+The available options, which can be set by ENV variables, are listed below:
+* `WAIT_FOR_COMPLETION` - a boolean flag. It controls async execution. It waits by default. When set to `false`, Elasticsearch performs some preflight checks, launches the request, and returns a task you can use to cancel the task or get its status.
+* `REQUESTS_PER_SECOND` - float. The throttle for this request in sub-requests per second.
+* `SCROLL_SIZE` - integer. The size of the scroll request that powers the operation.
 
 ```bash
 rake chewy:journal:clean WAIT_FOR_COMPLETION=false REQUESTS_PER_SECOND=10 SCROLL_SIZE=5000