docs: misc (#29622)

Co-authored-by: Christian Clason <c.clason@uni-graz.at>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>

src/nvim/indent_c.c

@@ -3419,9 +3419,7 @@ term_again:
       break;
     }
 
-    //
     // Skip preprocessor directives and blank lines.
-    //
     if (cin_ispreproc_cont(&l, &curwin->w_cursor.lnum, &amount)) {
       continue;
     }