QuarkPlatformPkg/Readme.md: Fix markdown format issue
QuarkPlatformPkg/Readme.md: Fix markdown format issue

https://bugzilla.tianocore.org/show_bug.cgi?id=769

Remove extra carriage return that causes formatting
issues.

Cc: Kelly Steele <fbcf235ba511603df821f72dd5b7e4b6e5618ca9@intel.com>
Cc: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Reviewed-by: Kelly Steele <fbcf235ba511603df821f72dd5b7e4b6e5618ca9@intel.com>

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