Update Programmers_Guide.md

docs/Programmers_Guide.md

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 # Programmers Guide
 
-## GraphSpace REST API
+## What is GraphSpace REST API ?
 
 The GraphSpace REST API provides endpoints for entities such as graphs, layouts, and groups that allow developers to interact with the GraphSpace website remotely by sending and receiving JSON objects. This API enables developers to create, read, and
 update GraphSpace content from client-side JavaScript or from applications written in any language. After a network is uploaded, the API allows the network owner to modify, delete, and share it. The API also allows a user to access several group management features available through the web interface. For example, a user can create or remove a group, add or remove members, obtain a list of groups he or she belongs to, and get information such as the membership on a group.