Update query name and remove periods

Author: vaisshnavi7

src/pages/[platform]/build-a-backend/data/custom-business-logic/index.mdx

@@ -518,17 +518,17 @@ Custom operations can accept different types of arguments. Understanding these o
 
 When defining a custom operation, you can specify arguments using different types:
 
-- **Scalar Fields**: Basic types such as `string`, `integer`, `float`, etc.
-- **Custom Types**: Define inline `customType`.
-- **Reference Types**: Use `a.ref()` to reference enums and custom types.
+- **Scalar Fields**: Basic types such as `string`, `integer`, `float`, etc
+- **Custom Types**: Define inline `customType`
+- **Reference Types**: Use `a.ref()` to reference enums and custom types
 
 ```ts title="amplify/data/resource.ts"
 const schema = a.schema({
   Status: a.enum({
     values: ['ACCEPTED', 'REJECTED']
   }),
 
-  echo: a
+  getPost: a
     .query()
     .arguments({
       // scalar field