[doc] Always call it Agents for consistency (#25958)

docs/source/en/custom_tools.md

@@ -25,7 +25,7 @@ If you are not aware of what tools and agents are in the context of transformers
 
 <Tip warning={true}>
 
-Transformers Agent is an experimental API that is subject to change at any time. Results returned by the agents
+Transformers Agents is an experimental API that is subject to change at any time. Results returned by the agents
 can vary as the APIs or underlying models are prone to change.
 
 </Tip>

docs/source/en/main_classes/agent.md

@@ -18,7 +18,7 @@ rendered properly in your Markdown viewer.
 
 <Tip warning={true}>
 
-Transformers Agent is an experimental API which is subject to change at any time. Results returned by the agents
+Transformers Agents is an experimental API which is subject to change at any time. Results returned by the agents
 can vary as the APIs or underlying models are prone to change.
 
 </Tip>

docs/source/en/transformers_agents.md

@@ -14,11 +14,11 @@ rendered properly in your Markdown viewer.
 
 -->
 
-# Transformers Agent
+# Transformers Agents
 
 <Tip warning={true}>
 
-Transformers Agent is an experimental API which is subject to change at any time. Results returned by the agents
+Transformers Agents is an experimental API which is subject to change at any time. Results returned by the agents
 can vary as the APIs or underlying models are prone to change.
 
 </Tip>

docs/source/ko/custom_tools.md

@@ -20,7 +20,7 @@ Transformers와 관련하여 어떤 도구와 에이전트가 있는지 잘 모
 
 <Tip warning={true}>
 
-Transformers Agent는 실험 중인 API로 언제든지 변경될 수 있습니다. 
+Transformers Agents는 실험 중인 API로 언제든지 변경될 수 있습니다. 
 API 또는 기반 모델이 변경되기 쉽기 때문에 에이전트가 반환하는 결과도 달라질 수 있습니다.
 
 </Tip>