Fix @onflow/fcl README typo (#1748)

Author: jribbink

packages/fcl/README.md

@@ -35,6 +35,6 @@ npm install --save @onflow/fcl @onflow/types
 
 ## Getting Started
 
-For a detailed guid explaining how to use `@onflow/fcl` to interact with Flow please see the [Flow App Quick Start](https://developers.flow.com/tutorials/flow-app-quickstart)
+For a detailed guide explaining how to use `@onflow/fcl` to interact with Flow please see the [Flow App Quick Start](https://developers.flow.com/tutorials/flow-app-quickstart)
 
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