* Stop quoting macro arguments that don't contain spaces.
* Stop defining content for the center header.
* Migrate procio(3) and top(1) to use ISO 8601 date format, like most of
the other man pages in this project.
* Add the day of the month to procps(3)'s and top(1)'s revision dates.
* Replace procio(3)'s inside footer, "Linux Manpage", with "procps-ng".
* Migrate procps(3), procps_misc(3), procps_pids(3) to use "procps-ng"
instead of "libproc2" as their inside footers, like all the other man
pages in this project.
groff_man_style(7):
Macro reference preliminaries
...
If a macro accepts multiple arguments, those containing space
characters must be double‐quoted to be interpreted correctly.
...
Document structure macros
...
.TH identifier section [footer‐middle [footer‐inside [header‐middle]]]
...
identifier and section are positioned at the left and right
in the header; the latter is set after the former, in
parentheses and without space. footer‐middle is centered in
the footer. By default, footer‐inside is positioned at the
bottom left. Use of the double‐sided layout option -rD1
places footer‐inside at the bottom left on recto
(odd‐numbered) pages, and the bottom right on verso
(even‐numbered) pages. By default, the outside footer is
the page number. Use of the continuous‐rendering option
-rcR=1 replaces it with identifier and section, as in the
header. header‐middle is centered in the header. If
section is an integer between 1 and 9 (inclusive), there is
no need to specify header‐middle; an.tmac supplies text for
it.
...
By convention, footer‐middle is the date of the most recent
modification to the man page source document, and footer‐
inside is the name and version or release of the project
providing it.
