Add a reminder of internal CRSF speed in model setup

radio/src/strhelpers.cpp

@@ -158,6 +158,13 @@ char *getStringAtIndex(char *dest, const char *s, int idx)
   return dest;
 }
 
+const char *getStringAtIndex(const char *s, int idx)
+{
+  uint8_t len = s[0];
+  return s + 1 + len * idx;
+}
+
+
 char *strAppendStringWithIndex(char *dest, const char *s, int idx)
 {
   return strAppendUnsigned(strAppend(dest, s), abs(idx));