mm: fix comment typo of truncate_inode_pages_range

The typo of API truncate_inode_pages_range is not updated.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/mm/truncate.c b/mm/truncate.c
index 632b15e..a188058 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -184,7 +184,7 @@
 }
 
 /**
- * truncate_inode_pages - truncate range of pages specified by start & end byte offsets
+ * truncate_inode_pages_range - truncate range of pages specified by start & end byte offsets
  * @mapping: mapping to truncate
  * @lstart: offset from which to truncate
  * @lend: offset to which to truncate