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/UserspaceEmulator.md

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+## Name
+
+UserspaceEmulator
+
+## Synopsis
+
+```sh
+$ UserspaceEmulator [--report-to-debug] [--pause] [--profile] [--profile-interval num_instructions] [--profile-file path] [--roi] <command...>
+```
+
+## Options:
+
+* `--help`: Display help message and exit
+* `--version`: Print version
+* `--report-to-debug`: Write reports to the debug log
+* `-p`, `--pause`: Pause on startup
+* `--profile`: Generate a ProfileViewer-compatible profile
+* `-i num_instructions`, `--profile-interval num_instructions`: Set the profile instruction capture interval, 128 by default
+* `--profile-file path`: File path for profile dump
+* `--roi`: Enable Region-of-Interest mode for profiling
+
+## Arguments:
+
+* `command`: Command to emulate
+
+<!-- Auto-generated through ArgsParser -->