Components: Update the Snackbar warning message

[Mamaduka]

What?

PR updates the Snackbar warning message copy to fix minor grammar issues.

Testing Instructions

1. Open a post or page.
2. Run snippet via DevTools console.
3. Confirm that the updated message is displayed.

// more then 1 action
wp.data.dispatch('core/notices').createNotice(
		'info',
		'Post published.', // Text string to display.
		{
			isDismissible: true, // Whether the user can dismiss the notice.
			// Any actions the user can perform.
			type: 'snackbar',
            actions: [
				{
					onClick: () => console.log( 'test' ),
					label: 'View post'
				},
				{
					onClick: () => console.log( 'test' ),
					label: 'View post'
				}
			]
		}
	);

[t-hamano]

LGTM 👍What do you think about adding this change to the CHANGELOG as an enhancement?

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core SVN

If you're a Core Committer, use this list when committing to wordpress-develop in SVN:

Props: mamaduka, wildworks.

GitHub Merge commits

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[Mamaduka]

I have updated the changelog.

@t-hamano, you might want to add WP.org email to your GH account - https://make.wordpress.org/core/handbook/tutorials/linking-your-github-and-w-org-profiles/#4-add-your-wordpress-org-git-email-to-your-github-email-list.

[t-hamano]

you might want to add WP.org email to your GH account

I had already added the email address to my GitHub account, but since I recently changed the password on my GitHub account, it appears that the connection with WP.org had been broken.

After re-linking and re-running the Props bot, it appears that the comment was updated correctly👍