ext4: Update documentation to correct the inode_readahead_blks option name

Per commit 240799cd, the option name for readahead should be
inode_readahead_blks, not inode_readahead.

Signed-off-by: Fang Wenqi <antonf@turbolinux.com.cn>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index af6885c..e1def17 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -196,7 +196,7 @@
 			also be used to enable or disable barriers, for
 			consistency with other ext4 mount options.
 
-inode_readahead=n	This tuning parameter controls the maximum
+inode_readahead_blks=n	This tuning parameter controls the maximum
 			number of inode table blocks that ext4's inode
 			table readahead algorithm will pre-read into
 			the buffer cache.  The default value is 32 blocks.