[Misc] Fix typos in spec. decode metrics logging. (#6470)

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com>

Author: tdoublep

vllm/engine/metrics.py

@@ -325,8 +325,8 @@ def _format_spec_decode_metrics_str(
                 f"System efficiency: {metrics.system_efficiency:.3f}, "
                 f"Number of speculative tokens: {metrics.num_spec_tokens}, "
                 f"Number of accepted tokens: {metrics.accepted_tokens}, "
-                f"Number of draft tokens tokens: {metrics.draft_tokens}, "
-                f"Number of emitted tokens tokens: {metrics.emitted_tokens}.")
+                f"Number of draft tokens: {metrics.draft_tokens}, "
+                f"Number of emitted tokens: {metrics.emitted_tokens}.")
 
 
 class PrometheusStatLogger(StatLoggerBase):
@@ -457,4 +457,4 @@ def log(self, stats: Stats):
 
 class RayPrometheusStatLogger(PrometheusStatLogger):
     """RayPrometheusStatLogger uses Ray metrics instead."""
-    _metrics_cls = RayMetrics
+    _metrics_cls = RayMetrics