fix(typos): 'unparseable' → 'unparsable' in ConfigFile.hpp

crate-ci/typos in CI rejects the -eable suffix on irregular roots;
'unparseable' is one of its dictionary entries.

Author: Abraham Sewill

src/host/ConfigFile.hpp

@@ -56,7 +56,7 @@ class ConfigFile {
     // Convenience: bool / int coercion via the same get() lookup.
     // Bool accepts {true, false, 1, 0, yes, no, on, off} case-
     // insensitive. Int accepts decimal. Returns nullopt on absent
-    // or unparseable; the caller is responsible for fall-through.
+    // or unparsable; the caller is responsible for fall-through.
     std::optional<bool> get_bool(std::string const& section,
                                  std::string const& key) const;
     std::optional<long> get_int (std::string const& section,