Fixing typo in sorted_vector_types.h
Fixing typo in sorted_vector_types.h

Summary:
title

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(Note: this ignores all push blocking failures!)

Reviewed By: Sushisugre

Differential Revision: D6688367

fbshipit-source-id: 6e2f2d3fcb897fe78c1caef841515856b1f2bd42

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