Libary select docs enhance

[d56ac3de-74e5-4879-a7d2-f1384a4edb9d]

BPO	35497
Nosy	@zhangyangyu, @miss-islington, @Zheaoli
PRs	python/cpython#11162 python/cpython#11235

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GitHub fields: ```python assignee = None closed_at = created_at = labels = ['3.8', 'type-feature', '3.7', 'docs'] title = 'Libary select docs enhance' updated_at = user = 'https://github.com/Zheaoli' ``` bugs.python.org fields: ```python activity = actor = 'xiang.zhang' assignee = 'docs@python' closed = True closed_date = closer = 'xiang.zhang' components = ['Documentation'] creation = creator = 'Manjusaka' dependencies = [] files = [] hgrepos = [] issue_num = 35497 keywords = ['patch'] message_count = 3.0 messages = ['331840', '332131', '332133'] nosy_count = 4.0 nosy_names = ['docs@python', 'xiang.zhang', 'miss-islington', 'Manjusaka'] pr_nums = ['11162', '11235'] priority = 'normal' resolution = 'fixed' stage = 'resolved' status = 'closed' superseder = None type = 'enhancement' url = 'https://bugs.python.org/issue35497' versions = ['Python 3.7', 'Python 3.8'] ```

[d56ac3de-74e5-4879-a7d2-f1384a4edb9d]

Since Python 3.7, Python adds a mask variable named EPOLLEXCLUSIVE for select.epoll. The mask variable is supported by the Linux Kernel since Kernel 4.5. So we can add a tip in this part of Python docs to notice the people the case.

[zhangyangyu]

New changeset 92330c0b6d6c253c41a133cc50caea4853c7e311 by Xiang Zhang (Manjusaka) in branch 'master': bpo-35497: add versionadded tag for EPOLLEXCLUSIVE (GH-11162) https://github.com/python/cpython/commit/92330c0b6d6c253c41a133cc50caea4853c7e311

[miss-islington]

New changeset a11d44056e4f9b64d28efec295e1c1c45d4cb9e1 by Miss Islington (bot) in branch '3.7': bpo-35497: add versionadded tag for EPOLLEXCLUSIVE (GH-11162) https://github.com/python/cpython/commit/a11d44056e4f9b64d28efec295e1c1c45d4cb9e1