app-misc/beep: fix fcaps usage & adjust further

This does not run fcaps_pkg_postinst, so the array is never used.

Also:
1. little reason to use arrays if going to immediately run
   fcaps_pkg_postinst on the next line (same for einstalldocs)
2. switch to 755 rather than 711, fcaps.eclass switched to allow
   world read in commit f8642f4a3e
   and I see no no reason to override that default here
3. drop fperms line, the Makefile does not set a suid-bit and
   defaults to 0755, so it's now redundant
4. use relative path for fcaps call, let eclass handle EROOT
5. fwiw drop INSTALL.md+PACKAGING.md, packager-intended docs are not
   interesting for users... also makes the line break at <80 chars :)

Fixes: 01e8782196
Closes: https://bugs.gentoo.org/947505
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

app-misc/beep/beep-1.4.12-r2.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -34,20 +34,12 @@ src_prepare() {
 
 src_install() {
 	dobin beep
-	doman "${PN}.1"
-
-	fperms 0711 /usr/bin/beep
-
-	local DOCS=(
-		CREDITS.md DEVELOPMENT.md INSTALL.md NEWS.md PACKAGING.md PERMISSIONS.md README.md
-	)
-	einstalldocs
+	doman ${PN}.1
+	dodoc CREDITS.md DEVELOPMENT.md NEWS.md PERMISSIONS.md README.md
 }
 
 pkg_postinst() {
-	FILECAPS=(
-		-m0711 cap_dac_override,cap_sys_tty_config "${EROOT}/usr/bin/beep"
-	)
+	fcaps -m 0755 cap_dac_override,cap_sys_tty_config usr/bin/beep
 
 	elog "Please note that for security reasons, beep will no longer allow"
 	elog "to running w/ SUID or as root under sudo. You will need to give"