flow + bson strings

Author: mayaraman19

source/fundamentals/bson/utf8-validation.txt

@@ -25,9 +25,10 @@ processing overhead since it needs to check the data.
 If you *disable* validation, your application avoids the validation processing
 overhead, but cannot guarantee consistent presentation of invalid UTF-8 data.
 
-The driver enables UTF-8 validation on documents coming from MongoDB by default. 
-It checks incoming documents for any characters that are not encoded in a 
-valid UTF-8 format when it transfers data from MongoDB to your application.
+By default, the driver enables UTF-8 validation on BSON strings in documents 
+from MongoDB. It checks incoming documents for any characters that are not 
+encoded in a valid UTF-8 format when it transfers data from MongoDB to your 
+application.
 
 .. note::