[PATCH v2 08/11] binman: Improve mkimage documentation

[Simon Glass]

Expand this a little to make things clearer. Also drop the invalid
entry arg.

Series-changes 2
- Make it clear that -d data is concatenated/collected by binman
- Fix mulitple typoe
- Reword a sentence for grammar

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v1)

 tools/binman/entries.rst      | 28 +++++++++++++++++++++-------
 tools/binman/etype/mkimage.py | 31 ++++++++++++++++++++++++-------
 2 files changed, 45 insertions(+), 14 deletions(-)

Applied to u-boot-dm, thanks!