[Doc][CI] Test examples in MyST files (ray-project#35964)

This PR makes CI test code-block-style (testcode) and doctest-style (>>>) examples in Markdown files.

Previously, CI only tested RST files (all libraries except for Serve use RST).

---------

Signed-off-by: Balaji Veeramani <[email protected]>

bazel/python.bzl

@@ -21,6 +21,7 @@ def doctest(files, gpu = False, name="doctest", deps=[], srcs=[], data=[], args=
  size = size,
  args = [
  "--doctest-modules",
+ "--doctest-glob='*.md'",
  "-c=$(location //bazel:conftest.py)",
  "-v"
  ] + args + ["$(location :%s)" % file for file in files],

doc/BUILD

@@ -308,7 +308,7 @@ py_test_run_all_subdirectory(
 
 doctest(
  files = glob(
- include=["source/**/*.rst"],
+ include=["source/**/*.rst", "source/**/*.md"],
  exclude=[
  "source/ray-contribute/getting-involved.rst",
  "source/ray-core/handling-dependencies.rst",
@@ -317,6 +317,9 @@ doctest(
  "source/ray-observability/user-guides/cli-sdk.rst",
  "source/rllib/rllib-env.rst",
  "source/rllib/rllib-sample-collection.rst",
+ "source/serve/multi-app.md",
+ "source/serve/production-guide/deploy-vm.md",
+ "source/serve/production-guide/fault-tolerance.md",
  "source/data/batch_inference.rst",
  "source/data/transforming-data.rst"
  ]