docs: migration headers keep the before and after, without ids, quotes or one library's numbers (#6277)

Applies rule 32's migration exception: each header still says what the
schema was, what changes and what it prevents, but task, milestone,
decision and rule ids are replaced by the practice they stood for, the
operator quotes by the decision, single-install counts are dropped, and
pointers to a deleted package and an external design doc are gone.
golang-migrate keeps no checksum, so editing applied migrations'
comments is safe.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/migrations/0079_acquisition_services.up.sql

@@ -1,11 +1,9 @@
 -- 0079_acquisition_services.up.sql — the indexers and download clients the
--- operator adds in Admin → Integrations (Scribe milestone #502, #5518).
+-- admin adds in Admin → Integrations.
 --
 -- Minstrel replaces Lidarr, so it searches and downloads itself. Nothing is
--- seeded and nothing is copied from Lidarr: a connection is a row the operator
--- adds, from a list of what Minstrel can speak. Ported from Fabled
--- Librarian's acquisition_services (its migrations 0044, 0055, 0062, 0064,
--- 0070), which settled the shape:
+-- seeded and nothing is copied from Lidarr: a connection is a row an admin
+-- adds, from a list of what Minstrel can speak:
 --
 --   kind      which list the row appears in: search (Indexers) or download
 --             (Download clients).
@@ -32,7 +30,7 @@ CREATE TABLE acquisition_services (
     label text NOT NULL,
     -- A new row is off: it has no address yet.
     enabled boolean NOT NULL DEFAULT false,
-    -- The address as the operator's browser opens it. For a Torznab feed it
+    -- The address as an admin's browser opens it. For a Torznab feed it
     -- is the whole feed URL up to and including /api.
     base_url text NOT NULL DEFAULT '',
     api_key text NOT NULL DEFAULT '',