[clang-format] Add --strip-trailing-cr to diff in docs_updated.test (#119666)

Fixes #119517.

Author: owenca

clang/test/Format/docs_updated.test

@@ -1,5 +1,6 @@
 // RUN: %python %S/../../docs/tools/dump_format_style.py -o %t.style
-// RUN: diff %t.style %S/../../docs/ClangFormatStyleOptions.rst
+// RUN: diff --strip-trailing-cr %t.style \
+// RUN:   %S/../../docs/ClangFormatStyleOptions.rst
 
 // RUN: %python %S/../../docs/tools/dump_format_help.py -o %t.help
-// RUN: diff %t.help %S/../../docs/ClangFormat.rst
+// RUN: diff --strip-trailing-cr %t.help %S/../../docs/ClangFormat.rst