strings: add ReplaceAll example

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This PR (HEAD: b707457) has been imported to Gerrit for code review.

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Patch Set 1:

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Message from Ian Lance Taylor:

Patch Set 1:

+bradfitz: I actually think that we should revert the change to strings/example_test.go in CL 137856.

Then we can do this CL separately to add an example of ReplaceAll.

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Message from Brad Fitzpatrick:

Patch Set 1:

Patch Set 1:

+bradfitz: I actually think that we should revert the change to strings/example_test.go in CL 137856.

Then we can do this CL separately to add an example of ReplaceAll.

Whoops. Sent CL 153843

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This PR (HEAD: 4a13500) has been imported to Gerrit for code review.

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Message from Brad Fitzpatrick:

Patch Set 4: Patch Set 3 was rebased

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Message from Brad Fitzpatrick:

Patch Set 4: Run-TryBot+1 Code-Review+2

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Patch Set 4:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=f33c3927

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Patch Set 4: TryBot-Result+1

TryBots are happy.

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This PR is being closed because golang.org/cl/153840 has been merged.