roll: recipes_version.txt post_attribution_roller_retrigger: Expand docstring

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/296352
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: 89336b7ab106c6b8127e3dc315703e6e67c2f563
GitOrigin-RevId: 376d279bf83f10e4e284c324048f2cbe3d444ba6
Change-Id: Iddb6297857b3069f4f969e01fcba3676752c4e5a

recipes_version.txt

diff --git a/recipes_version.txt b/recipes_version.txt
index 2ae98d7..59b1f02 100644
--- a/recipes_version.txt
+++ b/recipes_version.txt
@@ -1 +1 @@
-ec91a11f5b3e250a1bbaeb0676edcc0d23e11b48
+89336b7ab106c6b8127e3dc315703e6e67c2f563