docs: backtick parameter references in API comments

source/ast/ast.hon

@@ -156,7 +156,7 @@ InvalidView :: struct {
     diagnostic DiagnosticId
 }
 
-#! retains allocator for node storage and borrows source; release with deinit_builder.
+#! retains `allocator` for node storage and borrows `source`; release with deinit_builder.
 init_builder proc(allocator mem.Allocator, source []u8) Builder {
     return Builder{
         storage = Storage{