Various typo fixes - only in comments, no code changes.

Marlin/LiquidCrystalRus.cpp

   #include "WProgram.h"
 #endif
 
-// it is a russian alphabet translation
+// it is a Russian alphabet translation
 // except 0401 --> 0xa2 = ╗, 0451 --> 0xb5
 const PROGMEM uint8_t utf_recode[] = 
        { 0x41,0xa0,0x42,0xa1,0xe0,0x45,0xa3,0xa4,0xa5,0xa6,0x4b,0xa7,0x4d,0x48,0x4f,
 
   // SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
   // according to datasheet, we need at least 40ms after power rises above 2.7V
-  // before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
+  // before sending commands. Arduino can turn on way before 4.5V so we'll wait 50
   delayMicroseconds(50000); 
   // Now we pull both RS and R/W low to begin commands
   digitalWrite(_rs_pin, LOW);
   
   //put the LCD into 4 bit or 8 bit mode
   if (! (_displayfunction & LCD_8BITMODE)) {
-    // this is according to the hitachi HD44780 datasheet
+    // this is according to the Hitachi HD44780 datasheet
     // figure 24, pg 46
 
     // we start in 8bit mode, try to set 4 bit mode
     // finally, set to 8-bit interface
     writeNbits(0x02,4); 
   } else {
-    // this is according to the hitachi HD44780 datasheet
+    // this is according to the Hitachi HD44780 datasheet
     // page 45 figure 23
 
     // Send function set command sequence
     }    
   } else send(out_char, HIGH);
 #if defined(ARDUINO) && ARDUINO >= 100
-  return 1; // assume sucess 
+  return 1; // assume success 
 #endif
 }
 

Marlin/MarlinSerial.cpp

 
 #ifndef AT90USB
 // this next line disables the entire HardwareSerial.cpp, 
-// this is so I can support Attiny series and any other chip without a uart
+// this is so I can support Attiny series and any other chip without a UART
 #if defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H)
 
 #if UART_PRESENT(SERIAL_PORT)
   bool useU2X = true;
 
 #if F_CPU == 16000000UL && SERIAL_PORT == 0
-  // hardcoded exception for compatibility with the bootloader shipped
+  // hard coded exception for compatibility with the bootloader shipped
   // with the Duemilanove and previous boards and the firmware on the 8U2
   // on the Uno and Mega 2560.
   if (baud == 57600) {

Marlin/cardreader.cpp

    file_subcall_ctr=0;
    memset(workDirParents, 0, sizeof(workDirParents));
 
-   autostart_stilltocheck=true; //the sd start is delayed, because otherwise the serial cannot answer fast enought to make contact with the hostsoftware.
+   autostart_stilltocheck=true; //the SD start is delayed, because otherwise the serial cannot answer fast enough to make contact with the host software.
    lastnr=0;
   //power to SD reader
   #if SDPOWER > -1
 {
   if(!cardOK)
     return;
-  if(file.isOpen())  //replaceing current file by new file, or subfile call
+  if(file.isOpen())  //replacing current file by new file, or subfile call
   {
     if(!replace_current)
     {
   
   if(store_location)
   {
-    //future: store printer state, filename and position for continueing a stoped print
+    //future: store printer state, filename and position for continuing a stopped print
     // so one can unplug the printer and continue printing the next day.
     
   }

Marlin/ultralcd_st7920_u8glib_rrd.h

 #define ST7920_DAT_PIN  LCD_PINS_ENABLE
 #define ST7920_CS_PIN   LCD_PINS_RS
 
-//#define PAGE_HEIGHT 8   //128 byte frambuffer
-//#define PAGE_HEIGHT 16  //256 byte frambuffer
+//#define PAGE_HEIGHT 8   //128 byte framebuffer
+//#define PAGE_HEIGHT 16  //256 byte framebuffer
 #define PAGE_HEIGHT 32  //512 byte framebuffer
 
 #define WIDTH 128
         ST7920_SET_CMD();
         ST7920_WRITE_BYTE(0x08);       //display off, cursor+blink off
         ST7920_WRITE_BYTE(0x01);       //clear CGRAM ram
-        u8g_Delay(10);                 //delay for cgram clear
-        ST7920_WRITE_BYTE(0x3E);       //extended mode + gdram active
+        u8g_Delay(10);                 //delay for CGRAM clear
+        ST7920_WRITE_BYTE(0x3E);       //extended mode + GDRAM active
         for(y=0;y<HEIGHT/2;y++)        //clear GDRAM
         {
           ST7920_WRITE_BYTE(0x80|y);   //set y

Marlin/watchdog.h

 #include "Marlin.h"
 
 #ifdef USE_WATCHDOG
-  // intialise watch dog with a 1 sec interrupt time
+  // initialize watch dog with a 1 sec interrupt time
   void watchdog_init();
-  // pad the dog/reset watchdog. MUST be called at least every second after the first watchdog_init or avr will go into emergency procedures..
+  // pad the dog/reset watchdog. MUST be called at least every second after the first watchdog_init or AVR will go into emergency procedures..
   void watchdog_reset();
 #else
   //If we do not have a watchdog, then we can have empty functions which are optimized away.