Remove linebreak from elastic#75598 known-issue docs (elastic#97216)

Linebreaks in `preformatted text` are preserved in the rendered docs,
which is not what we want here.

docs/reference/release-notes/7.13.asciidoc

@@ -174,8 +174,8 @@ PUT _cluster/settings
 +
 This issue is fixed in {es} versions 7.14.1 and later. It is not possible to
 repair a repository once it is affected by this issue, so you must restore the
-repository from a backup, or clear the repository by executing `DELETE
-_snapshot/<repository name>/*`, or move to a fresh repository. For more
+repository from a backup, or clear the repository by executing
+`DELETE _snapshot/<repository name>/*`, or move to a fresh repository. For more
 details, see {es-issue}75598[#75598].
 // end::snapshot-repo-corruption-75598-known-issue[]