Fix typo in schemas for messaging attribute changes

[JamieDanielson]

Changes

While reviewing recent semantic convention changes, I noticed these typos for messaging changes.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• schema-next.yaml updated with changes to existing conventions.

[lmolkova]

Thank you!

[lmolkova]

it seems we should not update old schemas -

semantic-conventions/CONTRIBUTING.md

Lines 140 to 141 in c5093dd

	> DO NOT add your changes to files inside the `schemas` folder. Always add your
	> changes to the `schema-next.yaml` file.

I'd like to stop producing/updating these files manually - #1596.

Curious what brought your attention to these files, @JamieDanielson ? Do you happen to use them in any way?

[JamieDanielson]

Curious what brought your attention to these files, @JamieDanielson ? Do you happen to use them in any way?

We were updating our semantic conventions package in JS and wanted to make sure we captured the breaking changes since we also recently updated our build script. I just happened to notice the typo in the 0.28 schema file and put up a PR to fix it. We don't use this attribute anywhere as far as I can tell.