docs: update assist comment

Author: unvalley

crates/ide-assists/src/handlers/extract_expressions_from_format_string.rs

@@ -23,7 +23,7 @@ use syntax::{ast, AstNode, AstToken, NodeOrToken, SyntaxKind::COMMA, TextRange};
 // }
 //
 // fn main() {
-//     print!("{x + 1}$0");
+//     print!("{var} {x + 1}$0");
 // }
 // ```
 // ->
@@ -36,7 +36,7 @@ use syntax::{ast, AstNode, AstToken, NodeOrToken, SyntaxKind::COMMA, TextRange};
 // }
 //
 // fn main() {
-//     print!("{}"$0, x + 1);
+//     print!("{var} {}"$0, x + 1);
 // }
 // ```
 

crates/ide-assists/src/tests/generated.rs

@@ -637,7 +637,7 @@ macro_rules! print {
 }
 
 fn main() {
-    print!("{x + 1}$0");
+    print!("{var} {x + 1}$0");
 }
 "#####,
         r#####"
@@ -649,7 +649,7 @@ macro_rules! print {
 }
 
 fn main() {
-    print!("{}"$0, x + 1);
+    print!("{var} {}"$0, x + 1);
 }
 "#####,
     )