Remove changelog section from PR template (#6494)
Remove changelog section from PR template (#6494)

The changelog is generated from the PR's title so we remove the changelog section from the PR template.
Add note to inform that clear and meaningful PR title are important.

Signed-off-by: Stevan Le Meur <6dba881af4cba1a122d0b04a213a98098a56e86c@redhat.com>
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