docs: quote command line flags in comments as code

The lone-dash check read MAME's -rompath and -samplepath, QUASI88's
-romdir and RetroBat's -hash and -sp as half a dash glued to a word.
Quoted as code they read as flags. A C loop quoted in romdir.py and a
docstring in test_agnostic_scope no longer read as clause semicolons.

tests/test_agnostic_scope.py

@@ -58,7 +58,7 @@ class AgnosticScan(unittest.TestCase):
     def test_a_placeholder_scans_the_folder_another_profile_proves(self):
         """LRPS2 and PCEE2 name their BIOS <bios>.bin, which resolves nowhere.
 
-        On RetroArch yaps2 anchored pcsx2/bios/ for them; on Batocera no
+        On RetroArch yaps2 anchored pcsx2/bios/ for them. On Batocera no
         other libretro PS2 core runs, and the pack held nothing there. The
         folder where another profile of the system resolves a hashed dump of
         that shape is the evidence, that folder only.