no-mistakes(document): Restored [Unreleased] heading; added drop-unmanaged to migrate --allow help and snapshot

Author: dmealing

CHANGELOG.md

@@ -8,7 +8,7 @@ promises the **software** surface, `metamodelVersion` promises the **metadata**
 `^1.0.0` accepts a MINOR — so **a release that moves `metamodelVersion` says so in its entry
 here.**
 
-## [1.2.0] — Unreleased
+## [Unreleased]
 
 ### Docs
 

server/typescript/packages/cli/src/index.ts

@@ -178,7 +178,7 @@ MIGRATE FLAGS:
                         drop-column,drop-table,type-change,drop-index,drop-fk,
                         drop-check,drop-view,drop-view-cascade,
                         adopt-view,nullable-to-not-null,drop-identity-default,
-                        drop-comment
+                        drop-comment,drop-unmanaged
                         drop-column DELETES the column's data; for a renamed
                         column use --rename-column, which keeps it
   --on-ambiguous abort|rename|drop-add   Default abort

server/typescript/packages/cli/test/__snapshots__/cli.test.ts.snap

@@ -158,7 +158,7 @@ MIGRATE FLAGS:
                         drop-column,drop-table,type-change,drop-index,drop-fk,
                         drop-check,drop-view,drop-view-cascade,
                         adopt-view,nullable-to-not-null,drop-identity-default,
-                        drop-comment
+                        drop-comment,drop-unmanaged
                         drop-column DELETES the column's data; for a renamed
                         column use --rename-column, which keeps it
   --on-ambiguous abort|rename|drop-add   Default abort