manpath.1: align lists + tag spdx

[concussious]

No description provided.

[gperciva]

It's a bit late, but what's the policy for the placement of the SPDX line?

It looks like it's supposed to come after the copyright line, but given the example, perhaps that's only for .c and .h files:
https://docs.freebsd.org/en/articles/license-guide/

The man pages are inconsistent:

Total SPDX lines in man pages

$ git grep "SPDX-License" -- "*.[1-9]" | wc -l
235

SPDX appears 2 lines after Copyright

$ git grep -B2 "SPDX-License" -- "*.[1-9]" | grep "Copyright" | wc -l
17

SPDX appears 2 lines before Copyright

$ git grep -A2 "SPDX-License" -- "*.[1-9]" | grep "Copyright" | wc -l
177

SPDX appears after the license text

$ git grep -B2 "SPDX-License" -- "*.[1-9]" | grep DAMAGE | wc -l
32

There's 3856 man pages without a SPDX-License line. If there's a desire to add SPDX to all of them, a script would save a lot of time. (Same idea as b2c76c4 and fa9896e.)

[bsdimp]

Before license if the boilerplate license text is included. After the copyright line if not. Third party code is exempt: wherever so long as both are present.