terminal.txt: Update Vim 8.2.4812

Author: tsuyoshicho

en/terminal.txt

@@ -1285,6 +1285,8 @@ Put focus on the gdb window to type commands there.  Some common ones are:
 - next		execute the current line and stop at the next line
 - step		execute the current line and stop at the next statement,
 		entering functions
+- until		execute until past the current cursor line or past a specified
+		position or the current stack frame returns
 - finish	execute until leaving the current function
 - where		show the stack
 - frame N	go to the Nth stack frame
@@ -1303,6 +1305,7 @@ gdb:
 
  *:Step*	execute the gdb "step" command
  *:Over*	execute the gdb "next" command (`:Next` is a Vim command)
+ *:Until*	execute the gdb "until" command
  *:Finish*	execute the gdb "finish" command
  *:Continue*	execute the gdb "continue" command
  *:Stop*	interrupt the program