Issue #13268 has been reported by Marcus Stollsteimer.

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Bug #13268: [DOC] Restore docs for String#<<
https://bugs.ruby-lang.org/issues/13268

* Author: Marcus Stollsteimer
* Status: Open
* Priority: Normal
* Assignee: Marcus Stollsteimer
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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Since r56021 (Feature #12333), `String#<<` is not documented; the patch fixes this.

A backport should only be needed for 2.4.



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