Fix typo in usage comment

Fixes #8096.

RELNOTES: None
PiperOrigin-RevId: 244364621
diff --git a/tools/python/toolchain.bzl b/tools/python/toolchain.bzl
index cb4f488..6e8a62a 100644
--- a/tools/python/toolchain.bzl
+++ b/tools/python/toolchain.bzl
@@ -76,7 +76,7 @@
 ```python
 # In your BUILD file...
 
-load("@bazel_tools//tools/python/toolchain.bzl", "py_runtime_pair")
+load("@bazel_tools//tools/python:toolchain.bzl", "py_runtime_pair")
 
 py_runtime(
     name = "my_py2_runtime",