Merge pull request #1254 from jafingerhut/add-revision-history-entry-for-empty-key-list-for-table

Add revision history entry for PR #1132 defining empty key list for tables

Author: jafingerhut

p4-16/spec/P4-16-spec.mdk

@@ -8622,6 +8622,8 @@ The P4 compiler should provide:
 * Defined `entries` table property without `const`, for entries
   installed when the P4 program is loaded, but the control plane can
   later change them or add to them (Section [#sec-entries]).
+* Clarified behavior of table with no `key` property, or if its list
+  of keys is empty (Section [#sec-table-keys]).
 
 ## Summary of changes made in version 1.2.3, released July 11, 2022.