docs: clarify linkedSignal update behavior

Updates the linkedSignal documentation to specify that it updates its value when the source changes or when any signal referenced in the computation changes, ensuring the description accurately reflects its behavior.

Author: diegoinost02

adev/src/content/guide/signals/linked-signal.md

@@ -104,7 +104,7 @@ export class ShippingMethodPicker {
 
 When you create a `linkedSignal`, you can pass an object with separate `source` and `computation` properties instead of providing just a computation.
 
-The `source` can be any signal, such as a `computed` or component `input`. When the value of `source` changes, `linkedSignal` updates its value to the result of the provided `computation`.
+The `source` can be any signal, such as a `computed` or component `input`. The `linkedSignal` updates its value when the `source` changes or when any signal referenced in the `computation` changes, updating its value with the result of the provided `computation`.
 
 The `computation` is a function that receives the new value of `source` and a `previous` object. The `previous` object has two properties— `previous.source` is the previous value of `source`, and `previous.value` is the previous value of the `linkedSignal`. You can use these previous values to decide the new result of the computation.