Note the naming convention of files in share/skel and explain the "dot"

prefix is removed.

PR:	103828

usr.sbin/pw/pw.8

@@ -428,6 +428,11 @@ The new home directory is populated with the contents of the
 .Ar skeleton
 directory, which typically contains a set of shell configuration files that the
 user may personalize to taste.
+Files in this directory are usually named
+.Pa dot.config
+where the
+.Va dot
+prefix will be stripped.
 When
 .Fl m
 is used on an account with
@@ -598,6 +603,9 @@ Set the default
 directory, from which prototype shell and other initialization files are copied when
 .Nm
 creates a user's home directory.
+See description of
+.Fl k
+for naming conventions of these files.
 .It Xo
 .Fl u Ar min , Ns Ar max ,
 .Fl i Ar min , Ns Ar max