git: openjdk/amber-docs: Add Pattern Matching in the Java Object model doc

[duke]

Changeset: 54ee5b1a
Author:    briangoetz <brian at briangoetz.com>
Date:      2021-01-06 15:51:10 +0000
URL:       https://git.openjdk.java.net/amber-docs/commit/54ee5b1a

Add Pattern Matching in the Java Object model doc

! Makefile
! site/design-notes/extending-switch-for-patterns.md
+ site/design-notes/pattern-match-object-model.md
! site/design-notes/pattern-match-semantics.md
! site/design-notes/pattern-matching-for-java.md
! site/design-notes/records-and-sealed-classes.md
! site/design-notes/type-patterns-in-switch.md