README: Remove statement about libjaylink Git submodule

Change-Id: I552c08979849c66d7f8f559ccfd49d27f8b68bb8
Signed-off-by: Marc Schink <[email protected]>
Reviewed-on: https://review.openocd.org/c/openocd/+/7470
Tested-by: jenkins
Reviewed-by: Antonio Borneo <[email protected]>

Author: zapb-0

README

@@ -239,8 +239,7 @@ Optional CMSIS-DAP adapter driver needs HIDAPI library.
 
 Optional linuxgpiod adapter driver needs libgpiod library.
 
-Optional JLink adapter driver needs libjaylink; build from git can
-retrieve libjaylink as git submodule.
+Optional J-Link adapter driver needs libjaylink library.
 
 Optional ARM disassembly needs capstone library.