reword url ParseResult comment

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

packages/hurl_core/src/parser/url.rs

@@ -22,7 +22,7 @@ use crate::parser::reader::Reader;
 use crate::parser::{expr, ParseResult};
 
 pub fn url(reader: &mut Reader) -> ParseResult<Template> {
-    // Can not be JSON-encoded, nor empty.
+    // Must be neither JSON-encoded nor empty.
     // But more restrictive: whitelist characters, not empty
 
     let start = reader.state.clone();