Indicate that user segment is deprecated

src/docs/sdk/performance/dynamic-sampling-context.mdx

@@ -156,10 +156,10 @@ The value of this envelope header is a JSON object with the following fields:
 - `sample_rate` (string) - The sample rate as defined by the user on the SDK. This string should always be a number between (and including) 0 and 1 in a notation that is supported by the [JSON specification](https://www.json.org/json-en.html). If a `tracesSampler` callback was used for the sampling decision, its result should be used for `sample_rate` instead of the `tracesSampleRate` from `SentryOptions`. In case `tracesSampler` returns `True` it should be sent as `1.0`, `False` should be sent as `0.0`.
 - `release` (string) - The release name as specified in client options`.
 - `environment` (string) - The environment name as specified in client options.
-- `user_segment` (string) - User segment as set by the user with <Link to="/sdk/unified-api/#scope">`scope.set_user`</Link>.
+- [DEPRECATED] `user_segment` (string) - User segment as set by the user with <Link to="/sdk/unified-api/#scope">`scope.set_user`</Link>.
 - `transaction` (string, **only include if name has [good quality](#note-on-low-quality-transaction-names)**) - The transaction name set on the scope.
 
-It's important to note that at the moment, only `release`, `environment`, `user_segment` and `transaction` are used by the product for dynamic sampling functionality.
+It's important to note that at the moment, only `release`, `environment` and `transaction` are used by the product for dynamic sampling functionality.
 The rest of the context attributes, `trace_id`, `public_key`, and `sample_rate`, are used by Relay for internal decisions (like transaction sample rate smoothing).
 
 ### Baggage-Header
@@ -171,7 +171,7 @@ SDKs may use the following keys to set entries on `baggage` HTTP headers:
 - `sentry-sample_rate`
 - `sentry-release`
 - `sentry-environment`
-- `sentry-user_segment`
+- [DEPRECATED] `sentry-user_segment`
 - `sentry-transaction` (**only include if name has [good quality](#note-on-low-quality-transaction-names)**)
 
 SDKs must set all of the keys in the form of "`sentry-[name]`".