docs: use v1 tool version example

Signed-off-by: Zhongxuan Wang <daniewang@nvidia.com>

Author: zhongxuanwang-nv

docs/configure-plugins/adaptive/response-cache.mdx

@@ -385,7 +385,7 @@ arg_skip = ["trace_id"]
 members = ["docs_*", "unit_convert"]
 
 [components.config.response_cache.tools.overrides.docs_search]
-tool_version = "v2" # bump to intentionally stop reusing earlier results
+tool_version = "v1" # identifies the deployed tool contract
 ```
 
 An exact class member wins. Otherwise, Relay selects the most-specific matching