add doc and linting for test output compare attribute

lib/galaxy/tool_util/xsd/galaxy.xsd

@@ -1594,9 +1594,9 @@ by ``file`` using the ``compare`` attribute:
 - ``re_match``: each line of the history data set is compared to the regular
   expression specified in the corresponding line of the ``file``. The allowed
   number of non matching lines can be set with ``lines_diff`` and the history
-  and local dataset is sorted if ``sort`` is set to ``true``.
+  dataset is sorted if ``sort`` is set to ``true``.
 - ``re_match_multiline``: it is checked if the history data sets matches the
-  multi line regular expression given in ``file``. The history and local datasets are sorted
+  multi line regular expression given in ``file``. The history dataset is sorted
   before the comparison if the ``sort`` atrribute is set to ``true``.
 - ``contains``: check if each line in ``file`` is contained in the history data set.
   The allowed number of lines that are not contained in the history dataset

test/unit/tool_util/test_tool_linters.py

@@ -1633,8 +1633,14 @@ def test_tests_expect_num_outputs_filter(lint_ctx):
 def test_tests_compare_attrib_incompatibility(lint_ctx):
     tool_source = get_xml_tool_source(TESTS_COMPARE_ATTRIB_INCOMPATIBILITY)
     run_lint(lint_ctx, tests.lint_tsts, tool_source)
-    assert 'Test 1: Attribute decompress is incompatible with compare="re_match".' in lint_ctx.error_messages
-    assert 'Test 1: Attribute sort is incompatible with compare="contains".' in lint_ctx.error_messages
+    assert (
+        'Test 1: Attribute decompress is incompatible with compare="re_match".'
+        in lint_ctx.error_messages
+    )
+    assert (
+        'Test 1: Attribute sort is incompatible with compare="contains".'
+        in lint_ctx.error_messages
+    )
     assert not lint_ctx.info_messages
     assert len(lint_ctx.valid_messages) == 1
     assert not lint_ctx.warn_messages