Post-3.7 deprecation migration guide (#8315)

* 3.7 Migration Guide

* Update src/release/breaking-changes/3-7-deprecations.md

Co-authored-by: Parker Lougheed <parlough@gmail.com>

---------

Co-authored-by: Parker Lougheed <parlough@gmail.com>

Author: Piinks

src/release/breaking-changes/3-3-deprecations.md

@@ -138,7 +138,7 @@ The enum `DragAnchor`, and its uses in `Draggable.dragAnchor` &
 `LongPressDraggable.dragAnchor` were deprecated in v2.1.
 Use `dragAnchorStrategy` instead.
 
-This change allowed fo more accurate feedback of the draggable widget when used
+This change allowed for more accurate feedback of the draggable widget when used
 in conjunction with other widgets like `Stack` and `InteractiveViewer`.
 
 **Migration guide**