Manpages: Auto-generate many through ArgsParser

This set was hand-curated, guided by the questions:
- Does it have at least three options, i.e. is the help page
  non-trivial?
- Is the program unusual, i.e. does listing it in Help or on
  man.serenityos.org spread awareness?
- Is the program common, but we only implement a subset of 'common'
  flags?

Base/usr/share/man/man1/netstat.md

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+## Name
+
+netstat
+
+## Synopsis
+
+```sh
+$ netstat [--all] [--list] [--tcp] [--udp] [--program]
+```
+
+## Description
+
+Display network connections
+
+## Options:
+
+* `--help`: Display help message and exit
+* `--version`: Print version
+* `-a`, `--all`: Display both listening and non-listening sockets
+* `-l`, `--list`: Display only listening sockets
+* `-t`, `--tcp`: Display only TCP network connections
+* `-u`, `--udp`: Display only UDP network connections
+* `-p`, `--program`: Show the PID and name of the program to which each socket belongs
+
+<!-- Auto-generated through ArgsParser -->