Change syntax for multiple instances: #ID --> :ID

Turns out that #ID syntax for multiple instances, introduced in cb07556,
was very cumbersome to reference from the shell command line in the new
Finit client.  This patch changes the syntax from #ID to :ID, which also
means that listing services/jobs in the shell will look like JOB:ID.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

finit.conf

@@ -1,8 +1,5 @@
-# Sample finit.conf to demonstatre the syntax
+# Sample finit.conf to demonstrate the syntax
 #
-# Comments are lines that start with #, comments are only allowed
-# on separate lines.  The # sign is used inside service/run/task
-# stanzas to denote instance ID, see below.
 user admin
 host testbed
 
@@ -46,8 +43,8 @@ inetd time/tcp              nowait [2345] internal          -- UNIX rdate servic
 inetd ssh@eth0:222/tcp      nowait [2345] /usr/sbin/sshd -i -- SSH service
 inetd ssh/tcp               nowait [2345] /usr/sbin/sshd -i -- SSH service
 
-# For multiple instances of the same service, add #ID somewhere between
+# For multiple instances of the same service, add :ID somewhere between
 # the service/run/task keyword and the command.
-service #1 [2345] /sbin/httpd -f -h /http -p 80   -- Web server
-service #2 [2345] /sbin/httpd -f -h /http -p 8080 -- Old web server
+service :1 [2345] /sbin/httpd -f -h /http -p 80   -- Web server
+service :2 [2345] /sbin/httpd -f -h /http -p 8080 -- Old web server