Update docs/typescript/schemas.md

Co-authored-by: hasezoey <hasezoey@gmail.com>

docs/typescript/schemas.md

@@ -66,7 +66,7 @@ For example, the above code won't throw an error if `email` is optional in the d
 The Mongoose `Schema` class in TypeScript has 9 [generic parameters](https://www.typescriptlang.org/docs/handbook/2/generics.html):
 
 * `RawDocType` - An interface describing how the data is saved in MongoDB
-* `M` - The Mongoose model type. Can be omitted if there are no query helpers or instance methods to be defined.
+* `TModelType` - The Mongoose model type. Can be omitted if there are no query helpers or instance methods to be defined.
   * default: `Model<DocType, any, any>`
 * `TInstanceMethods` - An interface containing the methods for the schema.
   * default: `{}`