Documenting 5.2 as LTS release (#11111)

* Documenting 5.2 as LTS release

CHANGELOG.txt

@@ -7,8 +7,8 @@ Changelog
  * Maintenance: Update BeautifulSoup upper bound to 4.12.x (scott-8)
 
 
-5.2 (xx.xx.xxxx) - IN DEVELOPMENT
-~~~~~~~~~~~~~~~~
+5.2 LTS (xx.xx.xxxx) - IN DEVELOPMENT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
  * Redesigned page listing view (Ben Enright, Matt Westcott, Thibaud Colas, Sage Abdullah)
  * Support OpenSearch as an alternative to Elasticsearch (Matt Westcott)

docs/releases/5.2.md

@@ -1,4 +1,4 @@
-# Wagtail 5.2 release notes - IN DEVELOPMENT
+# Wagtail 5.2 (LTS) release notes - IN DEVELOPMENT
 
 _Unreleased_
 
@@ -9,6 +9,8 @@ depth: 1
 ---
 ```
 
+Wagtail 5.2 is designated a Long Term Support (LTS) release. Long Term Support releases will continue to receive maintenance updates as necessary to address security and data-loss related issues, up until the next LTS release (typically a period of 12 months).
+
 ## What's new
 
 ### Redesigned page listing view

docs/releases/upgrading.md

@@ -60,7 +60,7 @@ The compatible versions of Django and Python for each Wagtail release are:
 | Wagtail release | Compatible Django versions | Compatible Python versions |
 | --------------- | -------------------------- | -------------------------- |
 | 5.3             | 3.2, 4.1, 4.2              | 3.8, 3.9, 3.10, 3.11, 3.12 |
-| 5.2             | 3.2, 4.1, 4.2              | 3.8, 3.9, 3.10, 3.11, 3.12 |
+| 5.2 LTS         | 3.2, 4.1, 4.2              | 3.8, 3.9, 3.10, 3.11, 3.12 |
 | 5.1             | 3.2, 4.1, 4.2              | 3.8, 3.9, 3.10, 3.11       |
 | 5.0             | 3.2, 4.1, 4.2              | 3.7, 3.8, 3.9, 3.10, 3.11  |
 | 4.2             | 3.2, 4.0, 4.1              | 3.7, 3.8, 3.9, 3.10, 3.11  |