[9.0](backport #5670) [docs] Fix release notes (#5671)

* fix release notes (#5670)

(cherry picked from commit 589cd52)

# Conflicts:
#	docs/release-notes/_snippets/9.1.5/breaking-changes.md
#	docs/release-notes/_snippets/breaking-changes/9.1.md
#	docs/release-notes/_snippets/deprecations/9.1.md
#	docs/release-notes/_snippets/index/9.1.md

* fix conflicts

---------

Co-authored-by: Colleen McGinnis <[email protected]>

Author: mergify[bot]

docs/release-notes/_snippets/9.0.8/breaking.md renamed to docs/release-notes/_snippets/9.0.8/breaking-changes.md

@@ -1,3 +1,6 @@
+:::{include} /release-notes/_snippets/9.0.8/breaking-changes.md
+:::
+
 :::{include} /release-notes/_snippets/9.0.7/breaking-changes.md
 :::
 

docs/release-notes/_snippets/breaking-changes/9.0.md

@@ -1,3 +1,6 @@
+:::{include} /release-notes/_snippets/9.0.8/deprecations.md
+:::
+
 :::{include} /release-notes/_snippets/9.0.7/deprecations.md
 :::
 

docs/release-notes/_snippets/deprecations/9.0.md

@@ -1,3 +1,6 @@
+:::{include} /release-notes/_snippets/9.0.8/index.md
+:::
+
 :::{include} /release-notes/_snippets/9.0.7/index.md
 :::