JSON->YAML in glossary.mdx (#698)

Manifest is a YAML file, not JSON.

Author: YaroShkvorets

website/pages/en/glossary.mdx

@@ -38,7 +38,7 @@ title: Glossary
 
 - **Subgraph Developer**: A developer who builds and deploys a subgraph to The Graph's decentralized network.
 
-- **Subgraph Manifest**: A JSON file that describes the subgraph's GraphQL schema, data sources, and other metadata. [Here](https://github.com/graphprotocol/example-subgraph/blob/master/subgraph.yaml) is an example.
+- **Subgraph Manifest**: A YAML file that describes the subgraph's GraphQL schema, data sources, and other metadata. [Here](https://github.com/graphprotocol/example-subgraph/blob/master/subgraph.yaml) is an example.
 
 - **Epoch**: A unit of time within the network. Currently, one epoch is 6,646 blocks or approximately 1 day.