Fix two leaks in c-index-test found by LSan.

The result of clang_getCursorSpelling() needs to be clang_getCursorSpelling()ed.

llvm-svn: 207073
diff --git a/clang/include/clang-c/CXString.h b/clang/include/clang-c/CXString.h
index 592c4dc..cf198cb 100644
--- a/clang/include/clang-c/CXString.h
+++ b/clang/include/clang-c/CXString.h
@@ -31,7 +31,7 @@
  * \brief A character string.
  *
  * The \c CXString type is used to return strings from the interface when
- * the ownership of that string might different from one call to the next.
+ * the ownership of that string might differ from one call to the next.
  * Use \c clang_getCString() to retrieve the string data and, once finished
  * with the string data, call \c clang_disposeString() to free the string.
  */