doc: fix stream _writev
header level
#916
Closed
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Fixes this misaligned header:
![typo](https://camo.githubusercontent.com/ee0128cc6e55d1393bb40979eb8ce8e789727f4829bdc6b3432dc41202c6f3da/68747470733a2f2f692e696d6775722e636f6d2f4b6f756c746d682e706e67)