Fix typos in Documentation/: 'Q'-'R'

This patch fixes typos in various Documentation txts. The patch addresses
some words starting with the letters 'Q'-'R'.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index 3646a0a..c41a3e1 100644
--- a/Documentation/block/biodoc.txt
+++ b/Documentation/block/biodoc.txt
@@ -783,7 +783,7 @@
 
 	blk_queue_invalidate_tags(request_queue_t *q)
 
-	Clear the internal block tag queue and readd all the pending requests
+	Clear the internal block tag queue and re-add all the pending requests
 	to the request queue. The driver will receive them again on the
 	next request_fn run, just like it did the first time it encountered
 	them.