astreams: Improve variable naming consistency

acrate_astreams/src/activitystreams/jsonld.rs

@@ -25,7 +25,7 @@ impl StreamsJsonLD for &json_ld::Node {
 		
 		let r#str = match value.as_str() {
 			None => return Some(Err(anyhow!("Couldn't process property as JSON-LD string"))),
-			Some(string) => string
+			Some(r#str) => r#str
 		};
 		
 		let string = r#str.to_string();