fix lint in markdown file

Author: baileympearson

docs/field-level-encryption.md

@@ -215,4 +215,4 @@ const ModelWithBirthday = model.discriminator('ModelWithBirthday', new Schema({
 }));
 ```
 
-When generating encryption schemas, Mongoose merges all discriminators together for the all discriminators declared on the same namespace.  As a result, discriminators that declare the same key with different types are not supported.  Furthermore, all discriminators must share the same encryption type - it is not possible to configure discriminators on the same model for both CSFLE and QE.
+When generating encryption schemas, Mongoose merges all discriminators together for the all discriminators declared on the same namespace.  As a result, discriminators that declare the same key with different types are not supported.  Furthermore, all discriminators must share the same encryption type - it is not possible to configure discriminators on the same model for both CSFLE and QE.