Update important-upgrade-notes.rst

Author: amyblais

source/upgrade/important-upgrade-notes.rst

@@ -4,7 +4,7 @@ Important Upgrade Notes
 .. important::
    - Support for Mattermost Server v5.31 `Extended Support Release <https://docs.mattermost.com/administration/extended-support-release.html>`_ will come to the end of its life cycle on October 15, 2021. Upgrading to Mattermost Server v5.37 `Extended Support Release <https://docs.mattermost.com/administration/extended-support-release.html>`_ or later is required.
    - The deprecations `listed here <https://docs.mattermost.com/administration/changelog.html#upcoming-deprecations-in-mattermost-v6-0>`_ are planned for the Mattermost v6.0 release, which is scheduled for September 15, 2021. This list is subject to change prior to the release.
-   - Upgrading Mattermost can result in an error “ERROR: default for column "timezone" cannot be cast automatically to type jsonb” if you have non-JSON data in a column. This can also happen if the database data has been manipulated by external processes (e.g. plugins) and in cases where improper input data could get silently truncated due to varchar limits. The affected database column has to be manually fixed.
+   - Upgrading Mattermost can result in an error “ERROR: default for column "column_name" cannot be cast automatically to type jsonb” if you have non-JSON data in a column. This can also happen if the database data has been manipulated by external processes (e.g. plugins) and in cases where improper input data could get silently truncated due to varchar limits. The data in the affected database column has to be manually fixed.
 
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 | If you’re upgrading from a version earlier than... | Then...                                                                                                                                                          |