fix: rename away from LangGraph Platform (#6281)

some of these changes were obvious, and some were less obvious. In a few
spots, it felt like a judgement call if we should be saying LangSmith
Deployment of LangGraph Server. But hopefully either works.

libs/cli/langgraph_cli/cli.py

@@ -216,7 +216,7 @@ def up(
 ):
     click.secho("Starting LangGraph API server...", fg="green")
     click.secho(
-        """For local dev, requires env var LANGSMITH_API_KEY with access to LangGraph Platform.
+        """For local dev, requires env var LANGSMITH_API_KEY with access to LangSmith Deployment.
 For production use, requires a license key in env var LANGGRAPH_CLOUD_LICENSE_KEY.""",
     )
     with Runner() as runner, Progress(message="Pulling...") as set:
@@ -584,7 +584,7 @@ def dockerfile(
                         "\n",
                         "# LANGSMITH_API_KEY=your-api-key",
                         "\n",
-                        "# Or if you have a LangGraph Platform license key, "
+                        "# Or if you have a LangSmith Deployment license key, "
                         "then uncomment the following line: ",
                         "\n",
                         "# LANGGRAPH_CLOUD_LICENSE_KEY=your-license-key",