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doc: trigraph is removed in C++17

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
58/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
documentation

Research direction

Review the linked sections in doc/topics/file_iteration.html and doc/topics/local_iteration.html. Confirm which trigraph references are affected by C++17, update those passages to reflect their removal, and verify both documentation sections no longer make outdated claims.

Written by the indexing model from the issue text.

Description

Dominant language
C++
Stars
118
Forks
76
PR merge metrics
No merged PRs in 30d

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