fix spelling / grammar issues

Author: jeff-allen-mongo

source/changelog.txt

@@ -58,11 +58,11 @@ the `MongoDB Download Center
 Behavior Updates
 ~~~~~~~~~~~~~~~~
 
-The legacy ``mongo`` shell error handling different was not consistent
-between commands. ``mongosh`` now standardizes the user-facing behavior
-here. Whenever a shell helper issues a db command that results in
-``{ ok: 0 }`` ``mongosh`` throwsan error. Running the raw command,
-however, does not throw an exception and prints the server output.
+The legacy ``mongo`` shell error handling was not consistent between
+commands. ``mongosh`` now standardizes the user-facing behavior.
+Whenever a shell helper issues a command that results in ``{ ok: 0 }``
+``mongosh`` throws an exception and does not return the raw output from
+the server.
 
 Bug Fixes
 ~~~~~~~~~