The Vimscript use a wrong regex sample

In the line 112-118.
The sample put the pattern and string in wrong place, so the match test always false, the unmatch test always true.
I think the follow is better:
```
echo "hello" =~ "He" | " Regular expression match, uses 'ignorecase'
echo "hello" =~# "He" | " Regular expression match, case sensitive
echo "hello" =~? "He" | " Regular expression match, case insensitive
echo "hello" !~ "He" | " Regular expression unmatch, use 'ignorecase'
echo "hello" !~# "He" | " Regular expression unmatch, case sensitive
echo "hello" !~? "He" | " Regular expression unmatch, case insensitive
```