Update changelog for #12587 to be more accurate

Sean Quah · Sean Quah · commit 460181586856 · 2022-05-06T22:04:57.000+01:00
#12587 has fallen on the wrong side of the release cutoff to the rest of the related PRs. Signed-off-by: Sean Quah <seanq@element.io>
diff --git a/changelog.d/12587.misc b/changelog.d/12587.misc
@@ -1 +1 @@
-Add `@cancellable` decorator, for use on endpoint methods that can be cancelled when clients disconnect.
+Log status code of cancelled requests as 499 and avoid logging stack traces for them.
diff --git a/changelog.d/12663.misc b/changelog.d/12663.misc
@@ -0,0 +1 @@
+Log status code of cancelled requests as 499 and avoid logging stack traces for them.

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		-Add `@cancellable` decorator, for use on endpoint methods that can be cancelled when clients disconnect.
	`1`	`+Log status code of cancelled requests as 499 and avoid logging stack traces for them.`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Log status code of cancelled requests as 499 and avoid logging stack traces for them.`