pages*: make "See also" conform to the new syntax (#12756) (#12354)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: spageektti <git@spageektti.cc>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/apm.md

@@ -1,7 +1,7 @@
 # apm
 
 > Atom editor Package Manager.
-> See `atom`.
+> See also: `atom`.
 > More information: <https://github.com/atom/apm>.
 
 - Install a package from <http://atom.io/packages> or a theme from <http://atom.io/themes>: