docs: update validation usage examples and API key description in README

Author: Bharatram-altimate-ai

README.md

@@ -162,9 +162,9 @@ Full docs at **[altimate.ai](https://altimate.ai)**.
 The `/validate` skill lets you audit past AI agent sessions against a set of quality criteria — checking whether the agent's reasoning, tool calls, and final response were correct, grounded, and complete. It pulls conversation traces from the backend, runs them through an evaluation pipeline, and reports per-criterion pass/fail results with details.
 
 You can validate:
-- **A single trace**: `/validate <trace_id>`
-- **All traces in a session**: `/validate --session-id <session_id>`
-- **A date range for a user**: `/validate --from <datetime> --to <datetime> --user-id <user_id>`
+- **A single trace**: `/validate <trace_id> or /validate the trace <trace-id>`
+- **All traces in a session**: `/validate --session-id <session_id> or /validate all the traces in session id <session-id>`
+- **A date range for a user**: `/validate --from <datetime> --to <datetime> --user-id <user_id> or /validate for user id <user id> for <relative duration>/ from <start date time> to <end date time>`
 
 ### Setup
 
@@ -174,7 +174,7 @@ You can validate:
 altimate-code validate configure --api-key <your-key>
 ```
 
-This registers your key with the Altimate validation server and saves it to `~/.altimate-code/settings.json`. The `/validate` skill reads credentials from that file when running evaluations.
+The api key is got from your altimate account API KEY.
 
 **2. That's it** — the skill files are installed automatically the next time you start `altimate-code`.