Update umbraco-heartcore/getting-started/graphql-playground.md

Co-authored-by: jonat123 <[email protected]>

Author: DeadMonkeyX

umbraco-heartcore/getting-started/graphql-playground.md

@@ -31,7 +31,7 @@ The GraphQL Playground's build-in documentation and schema browser can be found
 
 This button will open a panel that grants you a quick overview of how content is structured using the Document Types in your solution.
 
-It also gives an idea of how to access specific properties on each document type, nested properties, and properties from compositions.
+It also gives an idea of how to access specific properties on each Document Type, nested properties, and properties from compositions.
 
 At the same time, it also explains relationships between specific objects and properties in your solution.