docs(maintainers): sort github aliases

The aliases for github were added either by alphabetical order or at the
end of list. Sort them alphabetically with Linux sort tool, regardless
of uppercase/lowercase letters.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: Ia247e102ab5fb0f7b8b6de76f23a869cc3f83d2c
1 file changed