tests: use raw strings in test-help.t
This avoids SyntaxWarning on Python 3.8 due to invalid \ escapes.
Differential Revision: https://phab.mercurial-scm.org/D5841
--- a/tests/test-help.t Mon Feb 04 14:10:10 2019 -0800
+++ b/tests/test-help.t Mon Feb 04 14:14:25 2019 -0800
@@ -1674,7 +1674,7 @@
Test omit indicating for help
$ cat > addverboseitems.py <<EOF
- > '''extension to test omit indicating.
+ > r'''extension to test omit indicating.
>
> This paragraph is never omitted (for extension)
>
@@ -1687,7 +1687,7 @@
> '''
> from __future__ import absolute_import
> from mercurial import commands, help
- > testtopic = b"""This paragraph is never omitted (for topic).
+ > testtopic = br"""This paragraph is never omitted (for topic).
>
> .. container:: verbose
>