aur-build.1: split sudoers rule

Improve overview especially when appending arguments to either command.

Author: AladW

man1/aur-build.1

@@ -457,7 +457,8 @@ For example, create the
 file with the following contents:
 .PP
 .EX
-    aurbuild ALL = (root) NOPASSWD: /usr/bin/pacman, /usr/lib/aurutils/aur-build--sync
+    aurbuild ALL = (root) NOPASSWD: /usr/bin/pacman
+    aurbuild ALL = (root) NOPASSWD: /usr/lib/aurutils/aur-build--sync
 .EE
 .PP
 The following