Inline all format arguments where possible

This makes code more readale and concise,
moving all format arguments like `format!("{}", foo)`
into the more compact `format!("{foo}")` form.

The change was automatically created with, so there are far less change
of an accidental typo.

```
cargo clippy --fix -- -A clippy::all -W clippy::uninlined_format_args
```

crates/syntax/src/tests/sourcegen_ast.rs

@@ -328,7 +328,7 @@ fn generate_nodes(kinds: KindsSrc<'_>, grammar: &AstSrc) -> String {
 
 fn write_doc_comment(contents: &[String], dest: &mut String) {
     for line in contents {
-        writeln!(dest, "///{}", line).unwrap();
+        writeln!(dest, "///{line}").unwrap();
     }
 }
 
@@ -501,7 +501,7 @@ fn to_pascal_case(s: &str) -> String {
 }
 
 fn pluralize(s: &str) -> String {
-    format!("{}s", s)
+    format!("{s}s")
 }
 
 impl Field {
@@ -637,7 +637,7 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, label: Option<&String>, r
             let mut name = grammar[*token].name.clone();
             if name != "int_number" && name != "string" {
                 if "[]{}()".contains(&name) {
-                    name = format!("'{}'", name);
+                    name = format!("'{name}'");
                 }
                 let field = Field::Token(name);
                 acc.push(field);
@@ -651,7 +651,7 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, label: Option<&String>, r
                 acc.push(field);
                 return;
             }
-            panic!("unhandled rule: {:?}", rule)
+            panic!("unhandled rule: {rule:?}")
         }
         Rule::Labeled { label: l, rule } => {
             assert!(label.is_none());