httpjson: remove leftover single quote

[efd6]

What does this PR do?

Minor clean-up to the docs page. Probably not worth a version bump; will be picked up with the next significant change.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

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• Start Time: 2022-12-01T21:32:17.338+0000

• Duration: 16 min 5 sec

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Passed	7
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Total	7

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 2.265
Classes	100.0% (0/0)	💚 2.265
Methods	100.0% (3/3)	💚 8.709
Lines	100.0% (0/0)	💚 7.986
Conditionals	100.0% (0/0)	💚

[kcreddy]

LGTM 👍🏼 Just need a minor clarification.

Should we have changelog.yml entry for this minor change?

[efd6]

Yeah, I'm not sure about that. It's in the process design, but I haven't seen it done before.

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Package httpjson - 1.6.1 containing this change is available at https://epr.elastic.co/search?package=httpjson