doc: release-notes: add Kernel details

Add release notes for the Kernel section based on the git log since 2.7 Signed-off-by: Dan Kalowsky <[email protected]>
MaJerle · Feb 18, 2022 · 6f96dec · 6f96dec
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commit 6f96dec
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diff --git a/doc/releases/release-notes-3.0.rst b/doc/releases/release-notes-3.0.rst
@@ -187,6 +187,7 @@ New APIs in this release
 Kernel
 ******
 
+  * Fixed timeout issues when SYSTEM_CLOCK_SLOPPY_IDLE is configured.
 
 Architectures
 *************