[Docs] Remove extraneous text (#40914)

Removes text that was likely introduced by copy/paste error.
elastic · Apr 5, 2019 · a17c570 · a17c570
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commit a17c570
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diff --git a/docs/reference/upgrade.asciidoc b/docs/reference/upgrade.asciidoc
@@ -37,7 +37,6 @@ deprecation warnings are logged when the log level is set to `WARN`.
 to your code and configuration for {version}.
 . If you use custom plugins, make sure compatible versions are available.
 . Test upgrades in a dev environment before upgrading your production cluster.
-before upgrading.
 . <<modules-snapshots,Back up your data!>> You must have a snapshot of your
 data to roll back to an earlier version.