Remove deprecation of the patch set num as revision ID

There are currently no plans to deprecate this.

Release-Notes: skip
Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I22a4a173d4b7ab02956bdbd1e4d441906fa9cff8

Documentation/rest-api-changes.txt

diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 79284de..950049b 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -6745,7 +6745,7 @@
 * a commit ID ("674ac754f91e64a0efb8087e59a176484bd534d1")
 * an abbreviated commit ID that uniquely identifies one revision of the
   change ("674ac754"), at least 4 digits are required
-* a legacy numeric patch number ("1" for first patch set of the change)
+* a numeric patch number ("1" for first patch set of the change)
 * "0" or the literal `edit` for a change edit
 
 [[json-entities]]