doc: fix some typos in documentations

Fix some typos in five documentations, no functional change.

Signed-off-by: Xishi Qiu <[email protected]>
Acked-by: Rob Landley <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
diff --git a/Documentation/md.txt b/Documentation/md.txt
index fbb2fcb..f925666 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -533,7 +533,7 @@
       found.  The count in 'mismatch_cnt' is the number of sectors
       that were re-written, or (for 'check') would have been
       re-written.  As most raid levels work in units of pages rather
-      than sectors, this my be larger than the number of actual errors
+      than sectors, this may be larger than the number of actual errors
       by a factor of the number of sectors in a page.
 
    bitmap_set_bits