Remove guidance about needing procfs

* Remove portions of pkg-message that mention needing /proc mounted.
  This hasn't been the case for a while afaik (I don't have it mounted
  and haven't observed any related problems).

java/openjdk11/pkg-message

@@ -1,18 +1,15 @@
 [
 { type: install
   message: <<EOM
-This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd and
-procfs(5) mounted on /proc.
+This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd
 
 If you have not done it yet, please do the following:
 
 	mount -t fdescfs fdesc /dev/fd
-	mount -t procfs proc /proc
 
 To make it permanent, you need the following lines in /etc/fstab:
 
 	fdesc	/dev/fd		fdescfs		rw	0	0
-	proc	/proc		procfs		rw	0	0
 EOM
 }
 ]

java/openjdk12/pkg-message

@@ -1,18 +1,15 @@
 [
 { type: install
   message: <<EOM
-This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd and
-procfs(5) mounted on /proc.
+This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd
 
 If you have not done it yet, please do the following:
 
 	mount -t fdescfs fdesc /dev/fd
-	mount -t procfs proc /proc
 
 To make it permanent, you need the following lines in /etc/fstab:
 
 	fdesc	/dev/fd		fdescfs		rw	0	0
-	proc	/proc		procfs		rw	0	0
 EOM
 }
 ]

java/openjdk8/pkg-message

@@ -1,18 +1,15 @@
 [
 { type: install
   message: <<EOM
-This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd and
-procfs(5) mounted on /proc.
+This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd
 
 If you have not done it yet, please do the following:
 
 	mount -t fdescfs fdesc /dev/fd
-	mount -t procfs proc /proc
 
 To make it permanent, you need the following lines in /etc/fstab:
 
 	fdesc	/dev/fd		fdescfs		rw	0	0
-	proc	/proc		procfs		rw	0	0
 EOM
 }
 ]