Fix typo and grammar

Author: Relequestual

pages/posts/postman-case-study.md

@@ -25,11 +25,11 @@ With JSON Schema being so ingrained in how APIs are developed today, it is hard
 
 ### How Postman uses JSON Schema to build its own APIs
 
-Postman operates a complex distributed system consisting of many dozens of microservices powering the cloud tools that make the Postman API Platform. These microservices make use of JSON Schema to model their interfaces through standalone JSON Schema definitions or OpenAPI and AsyncAPI specifications. Many of these microservices also use JSON Schema under the hood to validate internal data structures and configuration files, and to perform end-to-end testing by either asserting on expected responses or auto-generating input data from JSON Schema definitions. Being a Node.js company, Postman havs started efforts to analyze how they can rely on TypeScript annotations to automatically generate OpenAPI and AsyncAPI definitions from our codebases.
+Postman operates a complex distributed system consisting of many dozens of microservices powering the cloud tools that make the Postman API Platform. These microservices make use of JSON Schema to model their interfaces through standalone JSON Schema definitions or OpenAPI and AsyncAPI specifications. Many of these microservices also use JSON Schema under the hood to validate internal data structures and configuration files, and to perform end-to-end testing by either asserting on expected responses or auto-generating input data from JSON Schema definitions. Being a Node.js company, Postman have started efforts to analyze how they can rely on TypeScript annotations to automatically generate OpenAPI and AsyncAPI definitions from our codebases.
 
 Given the importance of API specifications for managing Postman's distributed systems, in 2021 a comprehensive internal research project was conducted to understand the diverse set of JSON Schema definitions introduced by microservices run within the internal Postman platform. The corresponding JSON Schema definitions were analyzed based on characteristics such as reusability, degree of similarity, uniqueness ratio, and type of content. To promote reusability and discoverability, Postman is exploring the idea of a new microservice that acts as a central JSON Schema catalog API.
 
-For analysis purposes, Postman periodically extract data from every SQL-based database powering the Postman API Platform. To accommodate for schema changes in our services, Postman automatically convert SQL table definitions into JSON Schema definitions, and rows into JSON documents, before aggregating them into Postman's internal data warehouse. Some initial experiments have been conducted to explore generating SQL table definitions out of JSON Schema documents, making the latter the source of truth.
+For analysis purposes, Postman periodically extracts data from every SQL-based database powering the Postman API Platform. To accommodate for schema changes in our services, Postman automatically converts SQL table definitions into JSON Schema definitions, and rows into JSON documents, before aggregating them into Postman's internal data warehouse. Some initial experiments have been conducted to explore generating SQL table definitions out of JSON Schema documents, making the latter the source of truth.
 
 ### Use cases of JSON Schema beyond APIs