Improve indexing of syntax symbols

BPO	21054
Nosy	@terryjreedy, @ezio-melotti
Dependencies	bpo-21048: Index 'as' in import and with statements bpo-21055: Index (augmented) assignment symbols

^{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:

assignee = None
closed_at = None
created_at = <Date 2014-03-24.23:26:18.413>
labels = ['type-feature', 'docs']
title = 'Improve indexing of syntax symbols'
updated_at = <Date 2014-05-26.16:15:43.909>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2014-05-26.16:15:43.909>
actor = 'terry.reedy'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2014-03-24.23:26:18.413>
creator = 'terry.reedy'
dependencies = ['21048', '21055']
files = []
hgrepos = []
issue_num = 21054
keywords = []
message_count = 3.0
messages = ['214761', '219149', '219163']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'ezio.melotti', 'docs@python']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue21054'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5']