More doctest refinements. (#83317)

Follow up to #82797

Now that the doctests themselves are in a better state, we should be able to enable xdoctest on the CI so they stay that way.

@ezyang @vadimkantorov
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83317
Approved by: https://github.com/ezyang

pytest.ini

@@ -7,11 +7,6 @@ addopts =
     # capture only Python print and C++ py::print, but not C output (low-level Python errors)
     --capture=sys
     --disable-warnings
-    # TODO: enable xdoctest later
-    #--xdoctest
-    #--xdoctest-style=google
-    #--xdoctest-global-exec="from torch import nn\nimport torch.nn.functional as F\nimport torch"
-    #--xdoctest-options=+IGNORE_WHITESPACE
 testpaths =
     test
 junit_logging_reruns = all