fix tabulation, remove long description (to be moved to documentation)

Signed-off-by: R4SAS <r4sas@i2pmail.org>

libi2pd/Config.cpp

@@ -314,16 +314,10 @@ namespace config {
 #ifdef __linux__
 		options_description unix_specific("UNIX-specific options");
 		unix_specific.add_options()
-            ("unix.handle_sigtstp", bool_switch()->default_value(false),
-                    "Switch to offline mode if received signal TSTP (SIGTSTP)"
-                    "(you   can send it by pressing CTRL+Z in terminal or with"
-                    " help commapnd kill and others, a.e pkill, if i2pd in "
-                    "daemon mode). If you need to switch to online mode, send"
-                    " signal CONT (SIGCONT)")
+			("unix.handle_sigtstp", bool_switch()->default_value(false),             "Handle SIGTSTP and SIGCONT signals (default: disabled)")
 		;
 #endif
 
-
 		m_OptionsDesc
 			.add(general)
 			.add(limits)