[boost] [interprocess] Fix doc build ASAP

Subject: [boost] [interprocess] Fix doc build ASAP
From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2017-02-06 23:04:27

This commit <
https://github.com/boostorg/interprocess/commit/936afb13f0c106728bcf36c1ce128f09abb0b6fd>
seems to have broken the release archive documentation build:

Generating Output File:
/home/ubuntu/build/boost/bin.v2/libs/interprocess/doc/docbook/gcc-4.9.2/debug/interprocess.xml
/home/ubuntu/boost/libs/interprocess/doc/interprocess.qbk:7421: error:
Mismatched [endsect] near column 9.
Error: Error count: 1.

Please fix ASAP.

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-- Rene Rivera
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