Fix the pf.conf(5) man page "endpoint-independent" section

[damjan.jov_gmail.com]

Summary

In commit 390dc369efaaeca2802baf168ddbd7a40e3afcc8, the "endpoint-independent" section was inserted in the middle of the "map-e-portset" section. Fix this.

Test Plan

Visibly check the look of the man page.

[damjan.jov_gmail.com]

Also fix the typo: "caues" -> "causes".

[thj]

Is there a reason this moves in the ordering of nat rules? We tend to aim for roughly alphabetical ordering if there isn't a reason for something different?

[damjan.jov_gmail.com]

Moves the "endpoint-independent" section to come after "bitmask", so they're in alphabetical order.

[damjan.jov_gmail.com]

In D47410#1082152, @thj wrote:

Is there a reason this moves in the ordering of nat rules? We tend to aim for roughly alphabetical ordering if there isn't a reason for something different?

That's fixed now, although most of the other entries are not in alphabetical order.

Also this is meant to repair the "map-e-portset" option, which began on line 2284, and was corrupted by having the "endpoint-independent" section pasted in the middle of it.