Fix a few typos in comments in GiN.

src/backend/access/gin/ginbtree.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *			$PostgreSQL: pgsql/src/backend/access/gin/ginbtree.c,v 1.7 2007/01/05 22:19:21 momjian Exp $
+ *			$PostgreSQL: pgsql/src/backend/access/gin/ginbtree.c,v 1.8 2007/02/01 04:16:07 neilc Exp $
  *-------------------------------------------------------------------------
  */
 
@@ -317,7 +317,7 @@ ginInsertValue(GinBtree btree, GinBtreeStack *stack)
 
 			/*
 			 * newlpage is a pointer to memory page, it doesn't associate
-			 * with buffer, stack->buffer shoud be untouched
+			 * with buffer, stack->buffer should be untouched
 			 */
 			newlpage = btree->splitPage(btree, stack->buffer, rbuffer, stack->off, &rdata);
 

src/backend/access/gin/ginbulk.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *			$PostgreSQL: pgsql/src/backend/access/gin/ginbulk.c,v 1.8 2007/01/31 15:09:45 teodor Exp $
+ *			$PostgreSQL: pgsql/src/backend/access/gin/ginbulk.c,v 1.9 2007/02/01 04:16:08 neilc Exp $
  *-------------------------------------------------------------------------
  */
 
@@ -187,7 +187,7 @@ ginChooseElem(BuildAccumulator *accum, ItemPointer heapptr, Datum *entries, uint
 
 /*
  * Insert one heap pointer. Suppose entries is sorted.
- * Insertion order trys to get binary tree balanced: first insert middle value,
+ * Insertion order tries to get binary tree balanced: first insert middle value,
  * next middle on left part and middle of right part.
  */
 void

src/backend/access/gin/ginget.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *			$PostgreSQL: pgsql/src/backend/access/gin/ginget.c,v 1.6 2007/01/31 15:09:45 teodor Exp $
+ *			$PostgreSQL: pgsql/src/backend/access/gin/ginget.c,v 1.7 2007/02/01 04:16:08 neilc Exp $
  *-------------------------------------------------------------------------
  */
 
@@ -168,7 +168,7 @@ startScanKey(Relation index, GinState *ginstate, GinScanKey key)
 		if (GinFuzzySearchLimit > 0)
 		{
 			/*
-			 * If all of keys more than treshold we will try to reduce result,
+			 * If all of keys more than threshold we will try to reduce result,
 			 * we hope (and only hope, for intersection operation of array our
 			 * supposition isn't true), that total result will not more than
 			 * minimal predictNumberResult.

src/backend/access/gin/gininsert.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *			$PostgreSQL: pgsql/src/backend/access/gin/gininsert.c,v 1.7 2007/01/31 15:09:45 teodor Exp $
+ *			$PostgreSQL: pgsql/src/backend/access/gin/gininsert.c,v 1.8 2007/02/01 04:16:08 neilc Exp $
  *-------------------------------------------------------------------------
  */
 
@@ -197,7 +197,7 @@ ginEntryInsert(Relation index, GinState *ginstate, Datum value, ItemPointerData
 
 /*
  * Saves indexed value in memory accumulator during index creation
- * Function isnt use during normal insert
+ * Function isn't use during normal insert
  */
 static uint32
 ginHeapTupleBulkInsert(GinBuildState *buildstate, Datum value, ItemPointer heapptr)

src/backend/access/gin/ginvacuum.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *			$PostgreSQL: pgsql/src/backend/access/gin/ginvacuum.c,v 1.11 2007/01/05 22:19:21 momjian Exp $
+ *			$PostgreSQL: pgsql/src/backend/access/gin/ginvacuum.c,v 1.12 2007/02/01 04:16:08 neilc Exp $
  *-------------------------------------------------------------------------
  */
 
@@ -466,7 +466,7 @@ ginVacuumPostingTree(GinVacuumState *gvs, BlockNumber rootBlkno)
 
 /*
  * returns modified page or NULL if page isn't modified.
- * Function works with original page until first change is occured,
+ * Function works with original page until first change is occurred,
  * then page is copied into temporary one.
  */
 static Page