Fix context provide decorator api doc (#1277)

Author: augustjk

packages/lit-dev-content/site/docs/v2/data/context.md

@@ -369,7 +369,7 @@ The `ValueType` type parameter is the type of value that can be provided by this
 
 ### `@provide()`
 
-A property decorator that adds a ContextConsumer controller to the component which will try and retrieve a value for the property via the Context API.
+A property decorator that adds a ContextProvider controller to the component making it respond to any `context-request` events from its children consumer.
 
 **Import**:
 

packages/lit-dev-content/site/docs/v3/data/context.md

@@ -367,7 +367,7 @@ The `ValueType` type parameter is the type of value that can be provided by this
 
 ### `@provide()`
 
-A property decorator that adds a ContextConsumer controller to the component which will try and retrieve a value for the property via the Context API.
+A property decorator that adds a ContextProvider controller to the component making it respond to any `context-request` events from its children consumer.
 
 **Import**: