Update docs to reflect Stream.contramap rename to mapInput (#320)

pages/docs/streaming/sink/operations.mdx

@@ -4,17 +4,17 @@ In the previous sections, we learned how to create and use sinks. Now, let's exp
 
 ## Changing the Input
 
-Sometimes, you have a sink that works perfectly with one type of input, but you want to use it with a different type. This is where `Sink.contramap` comes in handy. While `map` modifies the output of a function, `contramap` modifies the input. It allows you to adapt your sink to work with a different input.
+Sometimes, you have a sink that works perfectly with one type of input, but you want to use it with a different type. This is where `Sink.mapInput` comes in handy. While `map` modifies the output of a function, `mapInput` modifies the input. It allows you to adapt your sink to work with a different input.
 
-Imagine you have a `Sink.sum` that calculates the sum of incoming numeric values. However, your stream contains strings, not numbers. You can use `contramap` to convert your strings into numbers and make `Sink.sum` compatible with your stream:
+Imagine you have a `Sink.sum` that calculates the sum of incoming numeric values. However, your stream contains strings, not numbers. You can use `mapInput` to convert your strings into numbers and make `Sink.sum` compatible with your stream:
 
-```ts file=<rootDir>/src/streaming/sink/operations/contramap.ts
+```ts file=<rootDir>/src/streaming/sink/operations/mapInput.ts
 
 ```
 
 ## Transforming Both Input and Output
 
-If you need to change both the input and output of a sink, you can use `Sink.dimap`. It's an extended version of `contramap` that lets you transform both types. This can be useful when you need to perform a complete conversion between your input and output types:
+If you need to change both the input and output of a sink, you can use `Sink.dimap`. It's an extended version of `mapInput` that lets you transform both types. This can be useful when you need to perform a complete conversion between your input and output types:
 
 ```ts file=<rootDir>/src/streaming/sink/operations/dimap.ts