[DOC] Normalizers

[leanneeliatra]

Description

Addition of some information on normalisers onto the index page for Text analysis

Issues Resolved

Addresses part of https://github.com/opensearch-project/documentation-website/issues/1483

Version

all

Frontend features

n/a

Checklist

• [x] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions[bot]]

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[kolchfa-aws]

@leanneeliatra Please fix DCO when you have time. Thanks!

[vagimeli]

@udabhas Please review and approve for technical accuracy. Thank you.

[leanneeliatra]

@leanneeliatra @vagimeli Just a few changes. Thanks!

Thanks Nate they have been addressed & merged

[leanneeliatra]

@vagimeli I accidentally closed this PR. Reopening. The comments from the editorial review have been addressed and merged and the PR has been reviewed. This PR is now ready for the next step/closing as per @vagimeli instructions.