[patch] Fix typo and etc. in the document.

[h_east]

Hi Bram and Vimmers,

I attach a patch to this email.
Please confirm and include this.

eval.txt
- L2029: Remove space after `argc(`.

gui.txt
- L881: Remove extra white spaces.

if_perl.txt
- L48-L49: Indented and insert nreline. (This is proposal)

indent.txt
- L606, L611, L945: Marked up `searchpairpos()` and `searchpair()`.
- Many: Replace `&sw` to `shiftwidth()` in example..

motion.txt
- L1028: Delete trailing space.

options.txt
- L1060: `s/swap/backup/` Because here is the explanation of 'backupdir'.
- L2689-L2690: Convert leading white space character to tab.
- L2693: Remove trailing space.

pattern.txt
- L298: s/checkig/checking/

starting.txt
- L518: Insert spaces before and after 'runtimepath'.

tagsrch.txt
- L182-L183: Marked up `gettagstack()` and `settagstack()`.

--
Best regards,
Hirohito Higashi (h_east)

[Bram Moolenaar]

I'll include it, thanks!

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