docs: Document changes

Author: cako

MIGRATION_V1_V2.md

@@ -1,10 +1,9 @@
-# Migrating PyLops codes from V1 to V2
+# Migrating PyLops code from v1.x to v2.0
 
 This file is intended to guide users willing to convert their codes from PyLops v1 to PyLops v2.
 
 In the following we provide a detailed description of all the breaking changes introduced in v2, which
 should be used as a checklist when converting a piece of code using PyLops from v1 to v2.
 
-- XX
-- XX
-- XX
+- Several operators have deprecated `N` as a keyword. To migrate, pass only `dims` if both `N` and `dims` are currently being passed.
+If only `N` is being passed, ensure it is being passed as a value and not a keyword argument (e.g., change `Flip(N=100)` to `Flip(100)`).