DOCSP-25657 addresses limitations typo (#95)

Author: jmd-mongo

source/reference/limitations.txt

@@ -51,7 +51,7 @@ General Limitations
   <crud-concepts-dot-dollar-considerations>`.
 - Serverless clusters are not supported.
 - The MongoDB Shared Tier is not supported.
-- `Queryable Execution
+- `Queryable Encryption
   <https://www.mongodb.com/docs/v6.0/core/queryable-encryption/>`__ is
   not supported.