man: fix man-pages

The man-pages are using pre-formatted section to display the options for
all commands. The result on my system never looked correct:

OPTIONS
       --bundle value, -b value  path to the root [...]
          --console-socket value    path to an AF_UNIX [...]

The first line was always indented less than the other lines.

This commit makes the option block a pre-formatted block (as intended???) by
using 4 spaces instead of 3 spaces.

In addition the man-pages did not specify their name and section
correctly. This adds something like '% runc-run "8"' to all man-pages to
have correct title 'runc-run(8)' instead of 'NAME()' and it also adds
the section to the title: 'System Manager's Manual'.

This also fixes the use of '>' and '<' at multiple places. The markdown
source files were using "<container-id>" and similar which was (most of
the time) rendered as '""'. On some systems it was rendered correctly.

Signed-off-by: Adrian Reber <areber@redhat.com>

man/runc-start.8.md

@@ -1,10 +1,12 @@
+% runc-start "8"
+
 # NAME
    runc start - start executes the user defined process in a created container
 
 # SYNOPSIS
-   runc start <container-id>
+   runc start `<container-id>`
 
-Where "<container-id>" is your name for the instance of the container that you
+Where "`<container-id>`" is your name for the instance of the container that you
 are starting. The name you provide for the container instance must be unique on
 your host.