add and link page explaining surveys in myPlanet (fixes #3527)

[MelonLord8]

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Description, Screenshots and/or Screencast

Added a survey page to the myPlanet manual.

fixes #3527

Raw.Githack Preview Link

https://raw.githack.com/melonlord8/melonlord8.github.io/3527-adding-survey-info-page/index.html#!./pages/manual/myplanet/myPlanet-surveys.md