QL1.21: Finalize change notes for C/C++#1413

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jbj merged 6 commits intogithub:rc/1.21from

felicitymay:1.21/cpp-change-notes

Jun 7, 2019

Commits on Jun 6, 2019

Update text for consistency
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Sort table rows alphabetically
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Merge two rows for one query
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Commits on Jun 7, 2019

Update for feedback
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Remove redundant sentence
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Further corrections
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