Fix some comments (spelling).

Signed-off-by: Stefan Weil <weil@mail.berlios.de>

Index: trunk/exec.c
===================================================================
--- trunk.orig/exec.c	2009-04-19 13:32:50.000000000 +0200
+++ trunk/exec.c	2009-04-19 13:33:07.000000000 +0200
@@ -420,7 +420,7 @@
         /* in user mode, phys_ram_size is not meaningful */
         code_gen_buffer_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
 #else
-        /* XXX: needs ajustments */
+        /* XXX: needs adjustments */
         code_gen_buffer_size = (unsigned long)(ram_size / 4);
 #endif
     }
@@ -2314,7 +2314,7 @@
    page size. If (phys_offset & ~TARGET_PAGE_MASK) != 0, then it is an
    io memory page.  The address used when calling the IO function is
    the offset from the start of the region, plus region_offset.  Both
-   start_region and regon_offset are rounded down to a page boundary
+   start_region and region_offset are rounded down to a page boundary
    before calculating this offset.  This should not be a problem unless
    the low bits of start_addr and region_offset differ.  */
 void cpu_register_physical_memory_offset(target_phys_addr_t start_addr,
Index: trunk/vnc.c
===================================================================
--- trunk.orig/vnc.c	2009-04-19 13:32:21.000000000 +0200
+++ trunk/vnc.c	2009-04-19 13:33:07.000000000 +0200
@@ -65,7 +65,7 @@
     }
 
     /* Enough for the existing format + the 2 vars we're
-     * subsituting in. */
+     * substituting in. */
     addrlen = strlen(format) + strlen(host) + strlen(serv);
     addr = qemu_malloc(addrlen + 1);
     snprintf(addr, addrlen, format, host, serv);