[tool] fix: Typo fix -- Rename to_openai_function_tool_schema to get_openai_tool_schema (verl-project#2806)

### What does this PR do?

Fixes a typo in the docstring of some tools.
`to_openai_function_tool_schema()` does not exist.

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Author: wizeng23

verl/tools/base_tool.py

@@ -26,7 +26,7 @@ class BaseTool:
 
     A tool should support the following methods:
 
-    - `to_openai_function_tool_schema`: return the tool schema in OpenAI format.
+    - `get_openai_tool_schema`: return the tool schema in OpenAI format.
     - `create`: create a tool instance for a trajectory.
     - `execute`: execute the tool.
     - `calc_reward`: calculate the reward respect to tool state.

verl/tools/geo3k_tool.py

@@ -31,7 +31,7 @@
 
 class Geo3kTool(BaseTool):
     """A demo tool for calculating the reward of geo3k.
-    - `to_openai_function_tool_schema`: return the tool schema in OpenAI format.
+    - `get_openai_tool_schema`: return the tool schema in OpenAI format.
     - `create`: create a tool instance for a trajectory.
     - `execute`: execute the tool.
     - `calc_reward`: calculate the reward respect to tool state.

verl/tools/gsm8k_tool.py

@@ -31,7 +31,7 @@
 class Gsm8kTool(BaseTool):
     """A demo tool for calculating the reward of gsm8k.
 
-    - `to_openai_function_tool_schema`: return the tool schema in OpenAI format.
+    - `get_openai_tool_schema`: return the tool schema in OpenAI format.
     - `create`: create a tool instance for a trajectory.
     - `execute`: execute the tool.
     - `calc_reward`: calculate the reward respect to tool state.

verl/tools/sandbox_fusion_tools.py

@@ -101,7 +101,7 @@ def init_execution_pool(
 class SandboxFusionTool(BaseTool):
     """A tool for executing the code using sanbox fusion image.
 
-    - `to_openai_function_tool_schema`: return the tool schema in OpenAI format.
+    - `get_openai_tool_schema`: return the tool schema in OpenAI format.
     - `create`: create a tool instance for a trajectory.
     - `execute`: execute the tool.
     - `calc_reward`: calculate the reward respect to tool state.