Documentation updates (mainly thru vs. through).

diff --git a/debugger/break.c b/debugger/break.c
index 60bd6a5..332ddde 100644
--- a/debugger/break.c
+++ b/debugger/break.c
@@ -59,7 +59,7 @@
     addr.seg = DEBUG_context.SegCs;
     addr.off = DEBUG_context.Eip;
     /* FIXME: old code was using V86BASE(DEBUG_context)
-     * instead of passing thru DOSMEM_MemoryBase
+     * instead of passing through DOSMEM_MemoryBase
      */
     instr = (BYTE*)DEBUG_ToLinear(&addr);
 
@@ -142,7 +142,7 @@
     addr.seg = DEBUG_context.SegCs;
     addr.off = DEBUG_context.Eip;
     /* FIXME: old code was using V86BASE(DEBUG_context)
-     * instead of passing thru DOSMEM_MemoryBase
+     * instead of passing through DOSMEM_MemoryBase
      */
     instr = (BYTE*)DEBUG_ToLinear(&addr);
 
diff --git a/debugger/editline.c b/debugger/editline.c
index a904619..50ae04d 100644
--- a/debugger/editline.c
+++ b/debugger/editline.c
@@ -228,7 +228,7 @@
 	  break;
        default:
 	  DEBUG_Printf(DBG_CHN_FIXME, "shouldn't happen\n");
-	  /* fall thru */
+	  /* fall through */
        case WAIT_ABANDONED:
        case WAIT_TIMEOUT:
 	  return EOF;
diff --git a/debugger/msc.c b/debugger/msc.c
index 4bf7363..a459492 100644
--- a/debugger/msc.c
+++ b/debugger/msc.c
@@ -3033,7 +3033,7 @@
 
 /*========================================================================
  * look for stabs information in PE header (it's how mingw compiler provides its
- * debugging information), and also wine PE <-> ELF linking thru .wsolnk sections
+ * debugging information), and also wine PE <-> ELF linking through .wsolnk sections
  */
 enum DbgInfoLoad DEBUG_RegisterStabsDebugInfo(DBG_MODULE* module, HANDLE hFile, 
 					      void* _nth, unsigned long nth_ofs)