Add info about isolated prefix on DESCR file

Author: hellium6

pkgsrc/lang/zig-0.14.0/DESCR

@@ -8,3 +8,7 @@ optimality, and clarity.
 * Clear - precisely communicate your intent
   to the compiler and other programmers. The language imposes a
   low overhead to reading code.
+
+(This modified package installs in a different prefix than usual:
+${PREFIX}/zig-${PKGVERSION_NOREV} which might be something like:
+/usr/pkg/zig-0.14.0)

pkgsrc/lang/zig-0.14.0/Makefile

@@ -23,7 +23,7 @@ APPEND_VER=	${DISTNAME:S/zig-//:S/.//g:S/-//}
 ## e.g. "zig-isolated0140" or "zig-isolated0140dev3462+edabcf619". Both
 ## should be able to be installed at the same time.
 PKGNAME=	${DISTNAME:S/zig-/zig-isolated${APPEND_VER}-/}
-#PKGREVISION=	1
+PKGREVISION=	1
 CATEGORIES=	lang
 ## https://ziglang.org/builds/ is the official
 MASTER_SITES=	https://ziglang.org/builds/