[patch] Fixed typo in some documents.

[h_east]

Hi Bram and list,

I've attached a fix patch for the document.

Detail:

eval.txt
- L3510: The empty string check method is not correct.
- L11034: typo. s/are are/are/

gui.txt
- L1049: Remove unnecessary whitespace at the end of line.
- L1115: BALTIC is duplicated.
- After L1139: It has not been formatted.

motion.txt
- `gw` is missing.

options.txt
- L3622: Remove extra characters `- ` at the beginning of line.
- L5062: Move `E21` to a position that I think is appropriate.

pattern.txt
- L64, L68: Deletion omission of description about Vi.

usr_22.txt
- s/":cd"/`:cd`/
(I adjusted to the previous line correction)

usr_41.txt
- Add listener_flush().

various.txt
- Remove unbalanced right parenthesis.
(You may add a left parenthesis :-)

vi_diff.txt
- L202: typo. s/specificed/specified/
- L869, L1058: typo. s/Vim/Vi/
- L904: Added the reference of `WORD` and `Nmove`.

Check it out.

--
Best regards,
Hirohito Higashi (h_east)

[h_east]

I update a patch.

gui.txt
- s/VIETNAMESE ANSI/VIETNAMESE/

[Bram Moolenaar]

I'll include it, thanks.

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