rtt: Refactor some of the code

Author: HrMitrev

UsingRTT.md

@@ -121,7 +121,7 @@ grep 2000 HelloWorld.ino.map | grep RTT
 
 - ``monitor rtt send string``
 
-	push *string* to the rtt down buffer. It is equivalent to pushing the string to ttyBmpTarg.
+	push *string* to the RTT down buffer. It is equivalent to pushing the string to ttyBmpTarg.
 
 - ``monitor rtt ident``
 

src/command.c

@@ -97,7 +97,7 @@ const command_s cmd_list[] = {
 #ifdef ENABLE_RTT
 	{"rtt", cmd_rtt,
 		"[enable|disable|status|channel [0..15 ...]|ident [STR]|send [STR]|cblock|ram [RAM_START RAM_END]|"
-		"poll [MAXMS MMINMS AXERR]]"},
+		"poll [MAXMS MINMS MAXERR]]"},
 #endif
 #ifdef PLATFORM_HAS_TRACESWO
 #if defined TRACESWO_PROTOCOL && TRACESWO_PROTOCOL == 2