iso_8859-7.7: Charset pages unification, minor cleanups

- adjust references
- remove stray comments
- cosmetics

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/iso_8859-7.7

@@ -23,7 +23,6 @@
 .\" %%%LICENSE_END
 .\"
 .TH ISO_8859-7 7 2014-02-16 "Linux" "Linux Programmer's Manual"
-.nh
 .SH NAME
 iso_8859-7 \- ISO 8859-7 character set encoded in octal, decimal,
 and hexadecimal
@@ -57,8 +56,6 @@ The following table displays the characters in ISO 8859-7, which
 are printable and unlisted in the
 .BR ascii (7)
 manual page.
-.\" The fourth column will only show the proper glyphs
-.\" in an environment configured for ISO 8859-7.
 .TS
 l l l c lp-1.
 Oct	Dec	Hex	Char	Description
@@ -167,4 +164,6 @@ T}
 .SH NOTES
 ISO 8859-7 was formerly known as ELOT-928 or ECMA-118:1986.
 .SH SEE ALSO
-.BR ascii (7)
+.BR ascii (7),
+.BR charsets (7),
+.BR utf-8 (7)