Update watchpoint help to use new -s flag

[fjricci]

Summary

Flag updated in D233237

[sas]

Committed as r265421.

source/Commands/CommandObjectWatchpoint.cpp

 class CommandObjectWatchpointSetVariable : public CommandObjectParsed
 {
 public:
     CommandObjectWatchpointSetVariable (CommandInterpreter &interpreter) :
         CommandObjectParsed(interpreter,
                             "watchpoint set variable",
                             "Set a watchpoint on a variable. "
                             "Use the '-w' option to specify the type of watchpoint and "
-                            "the '-x' option to specify the byte size to watch for. "
+                            "the '-s' option to specify the byte size to watch for. "
                             "If no '-w' option is specified, it defaults to write. "
-                            "If no '-x' option is specified, it defaults to the variable's "
+                            "If no '-s' option is specified, it defaults to the variable's "
                             "byte size. "
                             "Note that there are limited hardware resources for watchpoints. "
                             "If watchpoint setting fails, consider disable/delete existing ones "
                             "to free up resources.",
                             nullptr,
                             eCommandRequiresFrame         |
                             eCommandTryTargetAPILock      |
                             eCommandProcessMustBeLaunched |
corresponding to the byte size of the data type."
         var_name_arg.arg_repetition = eArgRepeatPlain;
 
         // Push the variant into the argument entry.
         arg.push_back (var_name_arg);
             
         // Push the data for the only argument into the m_arguments vector.
         m_arguments.push_back (arg);
 
-        // Absorb the '-w' and '-x' options into our option group.
+        // Absorb the '-w' and '-s' options into our option group.
         m_option_group.Append (&m_option_watchpoint, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
         m_option_group.Finalize();
     }
 
     ~CommandObjectWatchpointSetVariable() override = default;
 
     Options *
     GetOptions () override

 class CommandObjectWatchpointSetExpression : public CommandObjectRaw
 {
 public:
     CommandObjectWatchpointSetExpression (CommandInterpreter &interpreter) :
         CommandObjectRaw(interpreter,
                          "watchpoint set expression",
                          "Set a watchpoint on an address by supplying an expression. "
                          "Use the '-w' option to specify the type of watchpoint and "
-                         "the '-x' option to specify the byte size to watch for. "
+                         "the '-s' option to specify the byte size to watch for. "
                          "If no '-w' option is specified, it defaults to write. "
-                         "If no '-x' option is specified, it defaults to the target's "
+                         "If no '-s' option is specified, it defaults to the target's "
                          "pointer byte size. "
                          "Note that there are limited hardware resources for watchpoints. "
                          "If watchpoint setting fails, consider disable/delete existing ones "
                          "to free up resources.",
                          nullptr,
                          eCommandRequiresFrame         |
                          eCommandTryTargetAPILock      |
                          eCommandProcessMustBeLaunched |
                          eCommandProcessMustBePaused   ),
         m_option_group (interpreter),
         m_option_watchpoint ()
     {
         SetHelpLong(
 R"(
 Examples:
 
-(lldb) watchpoint set expression -w write -x 1 -- foo + 32
+(lldb) watchpoint set expression -w write -s 1 -- foo + 32
 
     Watches write access for the 1-byte region pointed to by the address 'foo + 32')"
         );
 
         CommandArgumentEntry arg;
         CommandArgumentData expression_arg;
             
         // Define the only variant of this arg.
         expression_arg.arg_type = eArgTypeExpression;
         expression_arg.arg_repetition = eArgRepeatPlain;
 
         // Push the only variant into the argument entry.
         arg.push_back (expression_arg);
             
         // Push the data for the only argument into the m_arguments vector.
         m_arguments.push_back (arg);
 
-        // Absorb the '-w' and '-x' options into our option group.
+        // Absorb the '-w' and '-s' options into our option group.
         m_option_group.Append (&m_option_watchpoint, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
         m_option_group.Finalize();
     }
 
     ~CommandObjectWatchpointSetExpression() override = default;
 
     // Overrides base class's behavior where WantsCompletion = !WantsRawCommandString.
     bool