codeowners: add @jaellio as an approver (#4423)

I am nominating @jaellio to be an approver
for the osm repo as they have demonstrated
a good understanding of various areas of the
project while having contributed to core areas
such as observability, logging, tests, docs,
and releases.

**Maintainers**, if you agree with this nomination,
leave a "+1" comment and approve the the PR.

Signed-off-by: Shashank Ram <[email protected]>

CODEOWNERS

@@ -1,6 +1,6 @@
 # ref: https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners
 
-* @shashankram @snehachhabria @nojnhuh @draychev
+* @shashankram @snehachhabria @nojnhuh @draychev @jaellio
 
 # Emeritus maintainers
 # @michelleN @eduser25

CONTRIBUTOR_LADDER.md

@@ -72,7 +72,7 @@ A Maintainer must meet the rights, responsiblities, and requirements of a Contri
 
 Process of becoming a maintainer:
 
-1. Any current Maintainer may nominate a current Contributor to become a new Maintainer, by opening a PR against the root of the [OSM repository](https://github.com/openservicemesh/osm) adding the nominee to the [OWNERS file](https://github.com/openservicemesh/osm/blob/main/OWNERS).
+1. Any current Maintainer may nominate a current Contributor to become a new Maintainer, by opening a PR against the root of the [OSM repository](https://github.com/openservicemesh/osm) adding the nominee to the [CODEOWNERS file](https://github.com/openservicemesh/osm/blob/main/CODEOWNERS).
 2. The nominee will add a comment to the PR testifying that they agree to all requirements of becoming a Maintainer.
 3. A majority of the current Maintainers must then approve the PR.