fix: Update _evaluate_single_inference_result documentation

Merge #3123

Update `_evaluate_single_inference_result` documentation

COPYBARA_INTEGRATE_REVIEW=#3123 from alDuncanson:spelling-fix b7bb4d4
PiperOrigin-RevId: 823193022

Author: alDuncanson

src/google/adk/evaluation/local_eval_service.py

@@ -184,10 +184,10 @@ async def run_evaluation(inference_result):
   async def _evaluate_single_inference_result(
       self, inference_result: InferenceResult, evaluate_config: EvaluateConfig
   ) -> tuple[InferenceResult, EvalCaseResult]:
-    """Returns EvalCaseResult for the given inference result.
+    """Returns the inference result and its corresponding EvalCaseResult.
 
     A single inference result can have multiple invocations. For each
-    invocaiton, this method evaluates the metrics present in evaluate config.
+    invocation, this method evaluates the metrics present in evaluate config.
 
     The EvalCaseResult contains scores for each metric per invocation and the
     overall score.