[PATCH V2] doc: usage: modify mmc man-page

[Jaehoon Chung]

Modify mmc man-page.
- Change a description about mmc erase command.
- Add whitespace to distinguish.

Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---
Changelog on V2:
- Added Bin Meng's reviewed-tag
- Fixed typo in commit-msg
- Changed from count to cnt
---
 doc/usage/mmc.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/usage/mmc.rst b/doc/usage/mmc.rst
index 57284ed6741e..458c7642c076 100644
--- a/doc/usage/mmc.rst
+++ b/doc/usage/mmc.rst
@@ -40,7 +40,7 @@ The 'mmc write' command writes raw data to MMC device from memory address with b
     cnt
         block count
 
-The 'mmc erase' command erases MMC device from block offset until count.
+The 'mmc erase' command erases *cnt* blocks on the MMC device starting at block *blk#*.
 
     blk#
         start block offset
@@ -110,6 +110,7 @@ The 'mmc partconf' command shows or changes PARTITION_CONFIG field.
         partitions to access
 
 The 'mmc bootpart-resize' command changes sizes of boot and RPMB partitions.
+
     dev
         device number
     boot part size MB
-- 
2.29.0