[Docs] Fix indentation error introduced by r267447.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@267501 91177308-0d34-0410-b5e6-96231b3b80d8

docs/UndefinedBehaviorSanitizer.rst

@@ -93,13 +93,13 @@ Available checks are:
   -  ``-fsanitize=null``: Use of a null pointer or creation of a null
      reference.
   -  ``-fsanitize=object-size``: An attempt to potentially use bytes which
-    the optimizer can determine are not part of the object being accessed.
-    This will also detect some types of undefined behavior that may not
-    directly access memory, but are provably incorrect given the size of
-    the objects involved, such as invalid downcasts and calling methods on
-    invalid pointers. These checks are made in terms of
-    ``__builtin_object_size``, and consequently may be able to detect more
-    problems at higher optimization levels.
+     the optimizer can determine are not part of the object being accessed.
+     This will also detect some types of undefined behavior that may not
+     directly access memory, but are provably incorrect given the size of
+     the objects involved, such as invalid downcasts and calling methods on
+     invalid pointers. These checks are made in terms of
+     ``__builtin_object_size``, and consequently may be able to detect more
+     problems at higher optimization levels.
   -  ``-fsanitize=return``: In C++, reaching the end of a
      value-returning function without returning a value.
   -  ``-fsanitize=returns-nonnull-attribute``: Returning null pointer