docs/contributing: add missing `

[Lslightly]

add missing ` in docs/contributing.md

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Message from Jorropo:

Patch Set 1: Code-Review+2 Commit-Queue+1

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Patch Set 2:

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Patch Set 2: -Commit-Queue

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Patch Set 2: LUCI-TryBot-Result+1

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Patch Set 2: kokoro-CI+1

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Message from Hongxiang Jiang:

Patch Set 2: Code-Review+2

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Message from Madeline Kalil:

Patch Set 2: Code-Review+2

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This PR is being closed because golang.org/cl/656935 has been merged.