WalletWasabi.Documentation: fix typo's in Guides
MODIFY
WalletWasabi.Documentation/Guides/20190416HardwareWalletTestingGuide.md
WalletWasabi.Documentation/Guides/20190416HardwareWalletTestingGuide.md
-The hardware walelt testing guide can be found in the [documentation](https://docs.wasabiwallet.io/building-wasabi/HardwareWalletTestingGuide.html).
+The hardware wallet testing guide can be found in the [documentation](https://docs.wasabiwallet.io/building-wasabi/HardwareWalletTestingGuide.html).

MODIFY
WalletWasabi.Documentation/Guides/20190617ContributionGame.md
WalletWasabi.Documentation/Guides/20190617ContributionGame.md
-The contribution game can be found in the [documenation](https://docs.wasabiwallet.io/building-wasabi/ContributionGame.html).
+The contribution game can be found in the [documentation](https://docs.wasabiwallet.io/building-wasabi/ContributionGame.html).

WalletWasabi.Documentation: fix typo's in Guides