Merge pull request #15307 from skyran1278/patch-2

docs: update schema examples in schematypes.md

Author: vkarpov15

docs/schematypes.md

@@ -654,16 +654,16 @@ typeof question.answer; // 'bigint'
 ### Double {#double}
 
 Mongoose supports [64-bit IEEE 754-2008 floating point numbers](https://en.wikipedia.org/wiki/IEEE_754-2008_revision) as a SchemaType.
-Int32s are stored as [BSON type "double" in MongoDB](https://www.mongodb.com/docs/manual/reference/bson-types/).
+Doubles are stored as [BSON type "double" in MongoDB](https://www.mongodb.com/docs/manual/reference/bson-types/).
 
 ```javascript
-const studentsSchema = new Schema({
-  id: Double
+const temperatureSchema = new Schema({
+  celsius: Double
 });
-const Student = mongoose.model('Student', schema);
+const Temperature = mongoose.model('Temperature', temperatureSchema);
 
-const student = new Temperature({ celsius: 1339 });
-typeof student.id; // 'number'
+const temperature = new Temperature({ celsius: 1339 });
+temperature.celsius instanceof bson.Double; // true
 ```
 
 There are several types of values that will be successfully cast to a Double.
@@ -673,7 +673,7 @@ new Temperature({ celsius: '1.2e12' }).celsius; // 15 as a Double
 new Temperature({ celsius: true }).celsius; // 1 as a Double
 new Temperature({ celsius: false }).celsius; // 0 as a Double
 new Temperature({ celsius: { valueOf: () => 83.0033 } }).celsius; // 83 as a Double
-new Temperature({ celsius: '' }).celsius; // null as a Double
+new Temperature({ celsius: '' }).celsius; // null
 ```
 
 The following inputs will result will all result in a [CastError](validation.html#cast-errors) once validated, meaning that it will not throw on initialization, only when validated:
@@ -688,12 +688,12 @@ Mongoose supports 32-bit integers as a SchemaType.
 Int32s are stored as [32-bit integers in MongoDB (BSON type "int")](https://www.mongodb.com/docs/manual/reference/bson-types/).
 
 ```javascript
-const studentsSchema = new Schema({
+const studentSchema = new Schema({
   id: Int32
 });
-const Student = mongoose.model('Student', schema);
+const Student = mongoose.model('Student', studentSchema);
 
-const student = new Temperature({ celsius: 1339 });
+const student = new Student({ id: 1339 });
 typeof student.id; // 'number'
 ```