Minor fixes and enhancements for 2.0 docs.

[ec3ba2e3-e269-49bc-8c28-d46556923f78]

BPO	403140
Nosy	@gvanrossum, @freddrake
Files	None: None

^{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 = None closed_at = created_at = labels = ['docs'] title = 'Minor fixes and enhancements for 2.0 docs.' updated_at = user = 'https://bugs.python.org/esr' ``` bugs.python.org fields: ```python activity = actor = 'gvanrossum' assignee = 'esr' closed = True closed_date = None closer = None components = ['Documentation'] creation = creator = 'esr' dependencies = [] files = ['2999'] hgrepos = [] issue_num = 403140 keywords = ['patch'] message_count = 3.0 messages = ['35200', '35201', '35202'] nosy_count = 3.0 nosy_names = ['gvanrossum', 'fdrake', 'esr'] pr_nums = [] priority = 'normal' resolution = None stage = None status = 'closed' superseder = None type = None url = 'https://bugs.python.org/issue403140' versions = [] ```

[ec3ba2e3-e269-49bc-8c28-d46556923f78]

Fix some minor usage errors and anachronisms dating from before 2.0. Add some helpful material on application of fstat(2) to special files under Unix.

[freddrake]

Please check this in. Note that I will be making a couple of markup adjustments in libstat.tex after you've checked it in -- it's easier to make the changes than to describe them. ;-)

Thanks!

[gvanrossum]

This was checked in by Fred.