修改為較中性、持平的敘述。

Signed-off-by: Huei-Horng Yo <hiroshiyui@gmail.com>
增加 Archboot 一節。

Signed-off-by: Huei-Horng Yo <hiroshiyui@gmail.com>
Merge pull request #3 from hiroshiyui/master

微調新手上路頁面