LibWeb: Convert Ladybird notes in spec steps to // NB: ...

We have a couple of ways to designate spec notes and (our) developer
notes in comments, but we never really settled on a single approach. As
a result, we have a bit of a mixed bag of note comments on our hands.

To the extent that I could find them, I changed developer notes to
`// NB: ...` and changed spec notes to `// NOTE: ...`. The rationale for
this is that in most web specs, notes are prefixed by `NOTE: ...` so
this makes it easier to copy paste verbatim. The choice for `NB: ...` is
pretty arbitrary, but it makes it stand out from the regular spec notes
and it was already in wide use in our codebase.

Libraries/LibWeb/HTML/Scripting/Fetching.cpp

@@ -157,7 +157,8 @@ WebIDL::ExceptionOr<URL::URL> resolve_module_specifier(Optional<Script&> referri
         result = TRY(resolve_imports_match(normalized_specifier.to_byte_string(), as_url, import_map.imports()));
 
     // 12. If result is null, set it to asURL.
-    // Spec-Note: By this point, if result was null, specifier wasn't remapped to anything by importMap, but it might have been able to be turned into a URL.
+    // NOTE: By this point, if result was null, specifier wasn't remapped to anything by importMap, but it might have
+    //       been able to be turned into a URL.
     if (!result.has_value())
         result = as_url;
 

Libraries/LibWeb/HTML/Scripting/ImportMap.cpp

@@ -300,8 +300,8 @@ void merge_existing_and_new_import_maps(Window& global, ImportMap& new_import_ma
     // 1. Let newImportMapScopes be a deep copy of newImportMap's scopes.
     auto new_import_map_scopes = new_import_map.scopes();
 
-    // Spec-Note: We're mutating these copies and removing items from them when they are used to ignore scope-specific
-    //            rules. This is true for newImportMapScopes, as well as to newImportMapImports below.
+    // NOTE: We're mutating these copies and removing items from them when they are used to ignore scope-specific rules.
+    //       This is true for newImportMapScopes, as well as to newImportMapImports below.
 
     // 2. Let oldImportMap be global's import map.
     auto& old_import_map = global.import_map();