Change FIXME comment per reviewer suggestion

Author: davidBar-On

src/comment.rs

@@ -164,7 +164,7 @@ pub(crate) fn is_last_comment_block(s: &str) -> bool {
 /// ends on that line.
 fn is_first_comment_line_ends_comment(s: &str) -> bool {
     if s.starts_with("/*") {
-        // FIXME: mixed block and line comments on the line are not be properlly formatted,
+        // FIXME: mixed block and line comments on the same line are not properly formatted,
         // e.g. "/* Block comment /* // Line comment" at the end of the line.
         s.lines().next().map_or(false, |l| l.ends_with("*/"))
     } else if s.starts_with("//") {