Update extracts-concurrency-consistency-recency.yaml

Grammar / typos.

Author: milkie

source/includes/extracts-concurrency-consistency-recency.yaml

@@ -77,9 +77,9 @@ ref: isolate-cursor-snapshot
 content: |
 
    MongoDB cursors can return the same document more than once in some
-   situations. As a cursor returns documents other operations may
-   interleave with the query. If some of these operations change the
-   indexed field on the index used by the query; then the cursor will
+   situations. As a cursor returns documents, other operations may
+   interleave with the query. If one of these operations changes the
+   indexed field on the index used by the query, then the cursor could
    return the same document more than once.
 
    If your collection has a field or fields that are