Fix typo in a comment and wording of autobaud legend

src/hexls

@@ -48,7 +48,7 @@ my %feature = (
   'V'      => "  + `V` vector bootloader: patches the vector table itself during upload, skips verifying the first page\n",
   'p'      => "  + `p` bootloader protects itself from being overwritten\n",
   'r'      => "  + `r` preserves reset flags for the application in the register R2\n",
-  'a'      => "  + `a` autobaud detection (f_cpu/8n and less with discrete divisors, normally n = 2, 3, ...)\n",
+  'a'      => "  + `a` autobaud detection (f_cpu/8n using discrete divisors, n = 1, 2, ..., 256)\n",
   'c'      => "  + `c` bootloader provides chip erase functionality (only recommended for large MCUs)\n",
   '?'      => "  + `?` unable to tell from .hex file whether this feature is present\n",
   '.'      => "  + `.` unable to tell from .hex file whether this feature is present\n",

src/urboot.c

@@ -14,7 +14,7 @@
  *     + EEPROM read/write support
  *     + Vector bootloader for devices without a boot section or to save space on devices with one
  *     + Software UART: no hardware UART required, but also useful when the chip's CPU frequency
- *       and the bootloader's desired baud rate are incompatible (eg, 8 MHz and 115200 baud)
+ *       and the bootloader's desired baud rate are incompatible (eg, 8 MHz and 115,200 baud)
  *     + Subroutine pgm_write_page(sram, progmem) for applications so they can change themselves:
  *       on many MCUs the SPM write flash only works when called from the bootloader section
  *     + Dual programming from external SPI flash memory for over-the-air programming
@@ -570,7 +570,7 @@ void urbootPageWrite(void *sram, progmem_t pgm) {
  *   [  61563,   63437]
  *   [  7695,    61515] = [0.985*F_CPU/(8*256), 1.015*F_CPU/(8*33)]
  *
- * Notice that the ubiquituous 115300 baud is actually out of specs for popular 16 MHz MCU builds.
+ * Notice that the ubiquituous 115,200 baud is actually out of specs for popular 16 MHz MCU builds.
  * In practice, tolerances of up to 2.5% may actually work, though that is not recommended. Also
  * signal noise and cable length plays a big role in whether communication is stable. The maximum
  * permitted baud rate of F_CPU/8 may not always work. Above set of baud rates is generated by
@@ -592,7 +592,7 @@ void urbootPageWrite(void *sram, progmem_t pgm) {
  * and tx lines otherwise. The options RX and TX specify which pins are used for software I/O. The
  * syntax is the same as with LED and SFMCS: Use any pin descriptor in Atmel format such as
  * AtmelPB2 or as Arduino pin number as in TX=ArduinoPin2. Can be overwritten in Makefile. The
- * default baud rate depends on the CPU frequency of the board and is 115200 for 8 MHz or above.
+ * default baud rate depends on the CPU frequency of the board and is 115,200 for 8 MHz or above.
  *
  *
  * WDTO=<timeout> (watchdog timeout)