Fix DOCS-14509: Typo in schema validation docs for 5.0

Author: stennie

source/core/schema-validation.txt

@@ -208,7 +208,7 @@ validationLevel:
   the document with ``_id: 2`` as it does not meet the validation
   rules.
 
-Starting in MongDB version 5.0, the validator returns detailed error
+Starting in MongoDB version 5.0, the validator returns detailed error
 information when a validation condition isn't met. The error output is
 exhaustive - all errors are reported, not just the first one.