[clang-format] Put ports on separate lines in Verilog module headers

New:
```
module mh1
    (input var int in1,
     input var in2, in3,
     output tagged_st out);
endmodule
```

Old:
```
module mh1
    (input var int in1, input var in2, in3, output tagged_st out);
endmodule
```

`getNextNonComment` was modified to return a non-const pointer because
we needed to use it that way in `verilogGroupDecl`.

The comment on line 2626 was a typo.  We corrected it while modifying
the function.

Reviewed By: MyDeveloperDay

Differential Revision: https://reviews.llvm.org/D143825