[7.14](backport #27051) Fix typo in redis docs

[mergify]

This is an automatic backport of pull request #27051 done by Mergify.
Cherry-pick of e8ea14b has failed:

On branch mergify/bp/7.14/pr-27051
Your branch is up to date with 'origin/7.14'.

You are currently cherry-picking commit e8ea14bd2.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   metricbeat/module/redis/fields.go
	modified:   metricbeat/module/redis/info/_meta/fields.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   metricbeat/docs/fields.asciidoc

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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• Start Time: 2021-07-27T14:25:07.775+0000

• Duration: 81 min 28 sec

• Commit: 7c49852

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Test	Results
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Passed	8484
Skipped	2268
Total	10752

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Failed	0
Passed	8484
Skipped	2268
Total	10752