Clarify about fork() and the CPython runtime in the C-API docs.

[ericsnowcurrently]

BPO	38816
Nosy	@gpshead, @ericsnowcurrently, @phmc, @miss-islington
PRs	python/cpython#17176 python/cpython#17178

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = 'https://github.com/ericsnowcurrently' closed_at = created_at = labels = ['3.8', '3.9', 'docs'] title = 'Clarify about fork() and the CPython runtime in the C-API docs.' updated_at = user = 'https://github.com/ericsnowcurrently' ``` bugs.python.org fields: ```python activity = actor = 'eric.snow' assignee = 'eric.snow' closed = True closed_date = closer = 'eric.snow' components = ['Documentation'] creation = creator = 'eric.snow' dependencies = [] files = [] hgrepos = [] issue_num = 38816 keywords = ['patch'] message_count = 3.0 messages = ['356705', '356717', '356718'] nosy_count = 4.0 nosy_names = ['gregory.p.smith', 'eric.snow', 'pconnell', 'miss-islington'] pr_nums = ['17176', '17178'] priority = 'normal' resolution = 'fixed' stage = 'resolved' status = 'closed' superseder = None type = None url = 'https://bugs.python.org/issue38816' versions = ['Python 3.8', 'Python 3.9'] ```

[ericsnowcurrently]

The C-API docs are a bit sparse on the interplay between C fork() and the CPython runtime.

[miss-islington]

New changeset 73cdb0c6b2c3861e034004cdc57be5e726876078 by Miss Islington (bot) (Eric Snow) in branch 'master': bpo-38816: Add notes in the C-API docs about fork in subinterpreters. (GH-17176) https://github.com/python/cpython/commit/73cdb0c6b2c3861e034004cdc57be5e726876078

[miss-islington]

New changeset 7a5d4c7a8653cb6be126f87731802aa9a4bc90e2 by Miss Islington (bot) in branch '3.8': bpo-38816: Add notes in the C-API docs about fork in subinterpreters. (GH-17176) https://github.com/python/cpython/commit/7a5d4c7a8653cb6be126f87731802aa9a4bc90e2