Recent FAQ cleanup lost a reference to mg(1) (section 2.2).

Text editors seem fundamental enough to include in help.1.

While here, make consistent use of references to command arguments (Ar).

Rob

Index: help.1
===================================================================
RCS file: /cvs/src/share/man/man1/help.1,v
retrieving revision 1.1
diff -u -p -r1.1 help.1
--- help.1      27 Mar 2015 01:59:26 -0000      1.1
+++ help.1      15 Apr 2016 20:14:16 -0000
@@ -88,7 +88,7 @@ in the system password file
 .It Cm man
 Interface to the system manual pages.
 For any of the commands listed below, type
-.Ic man <command>
+.Ic man Ar command
 for detailed information on what it does and how to use it.
 .It Cm pwd
 Print working directory.
@@ -109,12 +109,20 @@ Type
 for a detailed listing.
 .It Cm cat
 Although it has many more uses,
-.Ic cat filename
+.Ic cat Ar filename
 will print the contents of a plain-text file to the screen.
+.It Cm vi
+Edit text files.
+.\" For example,
+.\" .Ic vi Ar filename .
+For example,
+.Ic vi Ar filename .
+See also
+.Xr mg 1 .
 .It Cm mkdir
 Make a directory.
 For example,
-.Ic mkdir foobar .
+.Ic mkdir Ar dirname .
 .It Cm rmdir
 Remove a directory.
 .It Cm rm

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