fix turbofish in suggest message

Author: koka831

clippy_lints/src/methods/unnecessary_join.rs

@@ -31,7 +31,7 @@ pub(super) fn check<'tcx>(
                 cx,
                 UNNECESSARY_JOIN,
                 span.with_hi(expr.span.hi()),
-                r#"called `.collect<Vec<String>>().join("")` on an iterator"#,
+                r#"called `.collect::<Vec<String>>().join("")` on an iterator"#,
                 "try using",
                 "collect::<String>()".to_owned(),
                 applicability,

tests/ui/unnecessary_join.stderr

@@ -1,4 +1,4 @@
-error: called `.collect<Vec<String>>().join("")` on an iterator
+error: called `.collect::<Vec<String>>().join("")` on an iterator
   --> $DIR/unnecessary_join.rs:11:10
    |
 LL |           .collect::<Vec<String>>()
@@ -8,7 +8,7 @@ LL | |         .join("");
    |
    = note: `-D clippy::unnecessary-join` implied by `-D warnings`
 
-error: called `.collect<Vec<String>>().join("")` on an iterator
+error: called `.collect::<Vec<String>>().join("")` on an iterator
   --> $DIR/unnecessary_join.rs:20:10
    |
 LL |           .collect::<Vec<_>>()