Remove \x13 (^S) character that was likely added by mistake.

[akuegel]

Summary

r287386 added a \x13 character inside a string literal. Most likely this was by mistake, so remove it.

source/Commands/CommandObjectThread.cpp

public:
 
   CommandObjectThreadUntil(CommandInterpreter &interpreter)
       : CommandObjectParsed(
             interpreter, "thread until",
             "Continue until a line number or address is reached by the "
             "current or specified thread.  Stops when returning from "
             "the current function as a safety measure.  "
             "The target line number(s) are given as arguments, and if more than one"
-            " is provided, stepping will stop when the first one is hit.␓",
+            " is provided, stepping will stop when the first one is hit.",
             nullptr,
             eCommandRequiresThread | eCommandTryTargetAPILock |
                 eCommandProcessMustBeLaunched | eCommandProcessMustBePaused),
         m_options() {
     CommandArgumentEntry arg;
     CommandArgumentData line_num_arg;
 
     // Define the first (and only) variant of this arg.