Fix spelling mistakes in guidelines

1)
paremeter ==> parameter
https://www.zabbix.com/documentation/guidelines/en/devel

2)
wil ==> will
https://www.zabbix.com/documentation/guidelines/en/thosts/configuration/discovery_rules

3)
suported ==> supported
https://www.zabbix.com/documentation/guidelines/en/thosts/configuration/templates

4)
shoud ==> should
funtions ==> functions
https://www.zabbix.com/documentation/guidelines/en/coding/php

5)
Psuedo ==> Pseudo
https://www.zabbix.com/documentation/guidelines/en/coding/html_css

6)
paremeter ==> parameter
canot ==> cannot
https://www.zabbix.com/documentation/guidelines/en/devel