doc: convert the remaining legacy syntax

The block conversion changed the bodies of the reference sections but
left every "**Syntax:**" header spelling the line-based format, so each
page opened by teaching the format it then stopped using.  Six files
were missed entirely: runparts, files, capabilities, requirements,
runlevels, and switchroot.

runparts had no block spelling written down anywhere, though the parser
has read `runparts`, `runparts-progress`, and `runparts-sysv` all along.

tty gains a table per variant.  Its three syntax lines carried nine
positional fields between them, which no longer describes anything the
parser accepts.

Fixes #148

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

doc/conditions.md

@@ -242,16 +242,16 @@ Composition
 -----------
 
 The `pid/` conditions are generated by the Finit `pidfile.so` plugin and
-composed from a service's `name:` and `:id`.  By default the basename of
-the daemon and the empty string.
+composed from a service's block title and its `:id`.  By default the
+basename of the daemon and the empty string.
 
-| **service**                                        | **condition**    |
-|----------------------------------------------------|------------------|
-| /sbin/foo                                          | pid/foo          |
-| /sbin/bar -p /run/baz.pid                          | pid/bar          |
-| name:lxc :foo lxc-start -n foo -p /run/lxc/foo.pid | pid/lxc:foo      |
-| /usr/bin/dbus-daemon                               | pid/dbus-daemon  |
-| :222 dropbear -p 222                               | pid/dropbear:222 |
+| **service**                                                       | **condition**    |
+|-------------------------------------------------------------------|------------------|
+| `service { command = "/sbin/foo" }`                                | pid/foo          |
+| `service { command = "/sbin/bar -p /run/baz.pid" }`               | pid/bar          |
+| `service lxc:foo { command = "lxc-start -n foo -p /run/lxc/foo.pid" }` | pid/lxc:foo  |
+| `service { command = "/usr/bin/dbus-daemon" }`                     | pid/dbus-daemon  |
+| `service dropbear:222 { command = "dropbear -p 222" }`             | pid/dropbear:222 |
 
 The condition is asserted when `pidfile.so` receives an inotify event
 for a file matching `/run/*.pid`, `/run/**/*.pid`, or `/run/**/pid`,