fix(rustfmt): fix struct field formatting with doc comments present

Fixes rust-lang#5215

Author: tharun208

Diff for: src/items.rs

@@ -1709,7 +1709,7 @@ pub(crate) fn rewrite_struct_field(
     let mut spacing = String::from(if field.ident.is_some() {
         type_annotation_spacing.1
     } else {
-        ""
+        " "
     });
     // Try to put everything on a single line.
     let attr_prefix = combine_strs_with_missing_comments(
@@ -1733,7 +1733,7 @@ pub(crate) fn rewrite_struct_field(
         .offset_left(overhead + spacing.len())
         .and_then(|ty_shape| field.ty.rewrite(context, ty_shape));
     if let Some(ref ty) = orig_ty {
-        if !ty.contains('\n') {
+        if !ty.contains('\n') && contains_comment(ty) {
             return Some(attr_prefix + &spacing + ty);
         }
     }