small misspelling fixes.

src/mips/assembler-mips.h

Index: src/mips/assembler-mips.h
===================================================================
--- src/mips/assembler-mips.h	(revision 14601)
+++ src/mips/assembler-mips.h	(working copy)
@@ -370,7 +370,7 @@
 };
 
 
-// On MIPS we have only one adressing mode with base_reg + offset.
+// On MIPS we have only one addressing mode with base_reg + offset.
 // Class MemOperand represents a memory operand in load and store instructions.
 class MemOperand : public Operand {
  public:
@@ -1129,7 +1129,7 @@
   // - space for labels.
   //
   // Space for trampoline slots is equal to slot_count * 2 * kInstrSize.
-  // Space for trampoline slots preceeds space for labels. Each label is of one
+  // Space for trampoline slots preceds space for labels. Each label is of one
   // instruction size, so total amount for labels is equal to
   // label_count *  kInstrSize.
   class Trampoline {