adjust package name in docs

Author: joshunrau

docs/en/4-concepts/4.1-instruments.mdx

@@ -21,7 +21,7 @@ an instrument (e.g., a title and description).
 ### Understanding TypeScript
 
 The structure of an _Instrument_ is defined in [TypeScript](https://www.typescriptlang.org/) by
-the `Instrument` type, located in the internal [`schemas`](https://github.com/DouglasNeuroInformatics/OpenDataCapture/tree/main/packages/schemas)
+the `Instrument` type, located in the [`@opendatacapture/runtime-core`](https://github.com/DouglasNeuroInformatics/OpenDataCapture/tree/main/packages/runtime-core)
 package. This definition is essentially a set of rules to validate that the key-value pairs in an _Instrument_
 conform with expectations in the codebase. These rules are quite complex and **heavily** rely on the concept
 of [discriminated unions](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#union-types) and