community/myrepos: fix wrong manpage path
Patchset from Thiago Perrotta tbperrotta@gmail.com via aports #3856:
Currently if one does `man mr` it fails with "man: No entry for mr in
the manual."
This commit correctly places it in man1/.
The APKBUILD has been simplified to be closer as intended by upstream
with `make install`.
Signed-off-by: Thiago Perrotta <tbperrotta@gmail.com>