fix element function documentation

[florenp]

element function support negative index starting in version 1.10.0, but documentation still says that it doesn't support it.

Target Release

1.12.x

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

[hashicorp-cla-app]

All committers have signed the CLA.

[crw]

This is the change that enabled this functionality: #35501

[crw]

When I run this, the output I get is:
"c"

This is true for the other examples as well. Is this system-dependent? (I am on MacOS.) If not, we should update the output to be correct as well.

[jbardin]

no, "c" is always correct, because it is a quoted string value.

[florenp]

@crw Ok for you?

[crw]

Hi @florenp, per @jbardin's comment, all of the output values should be quoted. That would be ideal. If you just want to make the change to quote your new output value, I will open a new PR to clean up the rest of the page. Or, you could update all of the examples. Either way. Thanks!

[florenp]

Hi @crw
That's done.

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