Update index.md

[skhalife]

Updated short title from "security harden" to "security hardening"

Why:

Updating a typo

What's being changed (if available, include any code snippets, screenshots, or gifs):

Updating the short title as to fix the typo here:

Check off the following:

• I have reviewed my changes in staging (look for the "Automatically generated comment" and click the links in the "Preview" column to view your latest changes).
• For content changes, I have completed the self-review checklist.

[github-actions]

👋 Hey there spelunker. It looks like you've modified some files that we can't accept as contributions. The complete list of files we can't accept are:
.devcontainer/**
.github/actions-scripts/**
.github/workflows/**
.github/CODEOWNERS
assets/fonts/**
data/graphql/**
Dockerfile*
lib/graphql/**
lib/redirects/**
lib/rest/**
lib/webhooks/**
package*.json
scripts/**
content/actions/deployment/security-hardening-your-deployments/**

You'll need to revert all of the files you changed in that list using GitHub Desktop or git checkout origin/main <file name>. Once you get those files reverted, we can continue with the review process.

[github-actions]

Automatically generated comment ℹ️

This comment is automatically generated and will be overwritten every time changes are committed to this branch.

The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
actions/deployment/security-hardening-your-deployments/index.md	fpt ghec ghes@ 3.7 3.6 3.5	fpt ghec ghes@ 3.7 3.6 3.5

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

👋 @skhalife Thanks so much for opening a PR! I'll get this triaged for review ⚡

[lucascosti]

Hi @skhalife, thanks for this PR, but that isn't a typo. 🙂

For the short titles, we generally try to use the non-gerund verb to save some space. So 'hardening' becomes 'harden'.