DOCSP-50240-case-info-regex (#12272)

* DOCSP-50240-case-info-regex

* added spell check

Author: oliviacaulfield

content/manual/upcoming/source/includes/indexes/case-insensitive-regex-queries.rst

@@ -1,3 +1,3 @@
-Case-insensitive indexes typically do not improve performance for
-:query:`$regex` queries. The ``$regex`` implementation is not
-collation-aware and cannot utilize case-insensitive indexes efficiently.
+Case-insensitive indexes do not improve performance for
+:query:`$regex` queries, as the ``$regex`` operator is not collation-aware 
+and therefore cannot take advantage of such indexes.