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docs: Add missing `+` in diff code block #1605

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Job	Run time
Rustfmt	5s
Test (stable)	1m 41s
Test (beta)	1m 51s
Test (nightly)	1m 47s
Test (macos)	3m 44s
Test (windows)	3m 59s
Test (msrv)	3m 46s
Success gate	1s
	16m 54s