Broken links in the Survey (Plan Pattern) page

[IeiuniumLux]

There are several broken links in the Survey (Plan Pattern) page.

https://docs.qgroundcontrol.com/en/PlanView/pattern_survey.html

[hamishwillee]

Thanks @IeiuniumLux - much appreciated. The images worked locally due to Windows ignoring file path case, but not on live system or github. I fixed all broken links in the English version. Note that there will be broken links in the Korean version, but these will be fixed up post-re-translation.