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.

scripts/romdir.py

@@ -21,7 +21,7 @@ from dataclasses import dataclass
 
 ENTRY_SIZE = 16
 NAME_SIZE = 10
-# for (i = 0; i < 512 * 1024; i++) in every LoadBiosVersion.
+# `for (i = 0; i < 512 * 1024; i++)` in every LoadBiosVersion.
 SEARCH_ENTRIES = 512 * 1024
 ROMVER_SIZE = 14
 EXTINFO_SIZE = 15