Trailing whitespace in a comment line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193668 91177308-0d34-0410-b5e6-96231b3b80d8
StackProtector.h: Fix trailing comments for doxygen. [-Wdocumentation]

  s!//<!///<!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193669 91177308-0d34-0410-b5e6-96231b3b80d8