Fix a few typos in comments and variable names.

Author: Michael Paquier
Discussion: https://www.postgresql.org/message-id/20180411075223.GB19732%40paquier.xyz

src/backend/access/nbtree/nbtinsert.c

@@ -1733,8 +1733,8 @@ _bt_checksplitloc(FindSplitData *state,
 	/*
 	 * The first item on the right page becomes the high key of the left page;
 	 * therefore it counts against left space as well as right space. When
-	 * index has included attribues, then those attributes of left page high
-	 * key will be truncate leaving that page with slightly more free space.
+	 * index has included attributes, then those attributes of left page high
+	 * key will be truncated leaving that page with slightly more free space.
 	 * However, that shouldn't affect our ability to find valid split
 	 * location, because anyway split location should exists even without high
 	 * key truncation.

src/backend/access/nbtree/nbtutils.c

@@ -2087,7 +2087,8 @@ btproperty(Oid index_oid, int attno,
  *
  *	Transforms an ordinal B-tree leaf index tuple into pivot tuple to be used
  *	as hikey or non-leaf page tuple with downlink.  Note that t_tid offset
- *	will be overritten in order to represent number of present tuple attributes.
+ *	will be overwritten in order to represent number of present tuple
+ *	attributes.
  */
 IndexTuple
 _bt_truncate_tuple(Relation idxrel, IndexTuple olditup)

src/bin/pg_dump/pg_dump.c

@@ -6726,7 +6726,7 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
 				i_indexname,
 				i_parentidx,
 				i_indexdef,
-				i_indnnkeyatts,
+				i_indnkeyatts,
 				i_indnatts,
 				i_indkey,
 				i_indisclustered,
@@ -6952,7 +6952,7 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
 		i_indexname = PQfnumber(res, "indexname");
 		i_parentidx = PQfnumber(res, "parentidx");
 		i_indexdef = PQfnumber(res, "indexdef");
-		i_indnnkeyatts = PQfnumber(res, "indnkeyatts");
+		i_indnkeyatts = PQfnumber(res, "indnkeyatts");
 		i_indnatts = PQfnumber(res, "indnatts");
 		i_indkey = PQfnumber(res, "indkey");
 		i_indisclustered = PQfnumber(res, "indisclustered");
@@ -6986,7 +6986,7 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
 			indxinfo[j].dobj.namespace = tbinfo->dobj.namespace;
 			indxinfo[j].indextable = tbinfo;
 			indxinfo[j].indexdef = pg_strdup(PQgetvalue(res, j, i_indexdef));
-			indxinfo[j].indnkeyattrs = atoi(PQgetvalue(res, j, i_indnnkeyatts));
+			indxinfo[j].indnkeyattrs = atoi(PQgetvalue(res, j, i_indnkeyatts));
 			indxinfo[j].indnattrs = atoi(PQgetvalue(res, j, i_indnatts));
 			indxinfo[j].tablespace = pg_strdup(PQgetvalue(res, j, i_tablespace));
 			indxinfo[j].indreloptions = pg_strdup(PQgetvalue(res, j, i_indreloptions));