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docs: added front-coded dictionaries to upgrade notes (#16647) 

* docs: add front-coded dictionareis to upgrade notes

* add it to release notes template
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13
docs/release-info/release-notes.md
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@ -97,6 +97,19 @@ This section contains detailed release notes separated by areas.
### Upgrade notes
#### Front-coded dictionaries
<!--Carry this forward until 32. Then move it to incompatible changes -->
In Druid 32.0.0, the front coded dictionaries feature will be turned on by default. Front-coded dictionaries reduce storage and improve performance by optimizing for strings where the front part looks similar.
Once this feature is on, you cannot easily downgrade to an earlier version that does not support the feature.
For more information, see [Migration guide: front-coded dictionaries](./migr-front-coded-dict.md).
If you're already using this feature, you don't need to take any action.
### Incompatible changes
### Developer notes

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docs/release-info/upgrade-notes.md
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@ -26,6 +26,18 @@ The upgrade notes assume that you are upgrading from the Druid version that imme
For the full release notes for a specific version, see the [releases page](https://github.com/apache/druid/releases).
## Announcements
#### Front-coded dictionaries
In Druid 32.0.0, the front coded dictionaries feature will be turned on by default. Front-coded dictionaries reduce storage and improve performance by optimizing for strings where the front part looks similar.
Once this feature is on, you cannot easily downgrade to an earlier version that does not support the feature.
For more information, see [Migration guide: front-coded dictionaries](./migr-front-coded-dict.md).
If you're already using this feature, you don't need to take any action.
## 30.0.0
### Upgrade notes