Btrfs: fix typos in comments

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index a5310c0..1c36e5c 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -60,8 +60,8 @@
 
 /*
  * unfortunately, many of the places that currently set a lock to blocking
- * don't end up blocking for every long, and often they don't block
- * at all.  For a dbench 50 run, if we don't spin one the blocking bit
+ * don't end up blocking for very long, and often they don't block
+ * at all.  For a dbench 50 run, if we don't spin on the blocking bit
  * at all, the context switch rate can jump up to 400,000/sec or more.
  *
  * So, we're still stuck with this crummy spin on the blocking bit,