DOC: config: fix confusing init-state examples

DOC: config: fix confusing init-state examples

in 50322dff ("MEDIUM: server: add init-state"), some examples on how to
use init-state server keyword were added alongside with the keyword
documentation.

However, as reported by Nick Ramirez, there was an error because the
example that stated that haproxy will pass the traffic to the server after
3 successful health checks used the "init-state down" instead of the
"init-state fully-down". Thus the behavior wouldn't match what the
comment said (only 1 successful health check was required).

Here we fix the example in itself to match with the comment. Also the
following example ("# or") was also affected, but it is kind of
redundant as the main purpose of the examples are to illustrate the
feature in itself and not how to use server-template directive, so we
remove it.

This should be backported in 3.1 with 50322dff