unicode/bidi: fix typo in variable name

[TysonAndre]

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Message from Brad Fitzpatrick:

Patch Set 1:

(1 comment)

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This PR (HEAD: 695749b) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/text/+/230198 to see it.

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See the Wiki page for more info

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Message from Brad Fitzpatrick:

Patch Set 2: Run-TryBot+1 Code-Review+2

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Message from Gobot Gobot:

Patch Set 2:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=9c042bf6

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This PR is being closed because golang.org/cl/230198 has been merged.