Document the --code-highlight default (#9883)

Also normalized all help text using the patterns:

* `One sentence help text`
* `First sentence of help. Second sentence of help.`

testing/test_config.py

@@ -2117,8 +2117,8 @@ class TestDebugOptions:
         result = pytester.runpytest("-h")
         result.stdout.fnmatch_lines(
             [
-                "*store internal tracing debug information in this log*",
-                "*This file is opened with 'w' and truncated as a result*",
-                "*Defaults to 'pytestdebug.log'.",
+                "*Store internal tracing debug information in this log*",
+                "*file. This file is opened with 'w' and truncated as a*",
+                "*Default: pytestdebug.log.",
             ]
         )

testing/test_helpconfig.py

@@ -30,11 +30,11 @@ def test_help(pytester: Pytester) -> None:
     assert result.ret == 0
     result.stdout.fnmatch_lines(
         """
-          -m MARKEXPR           only run tests matching given mark expression.
-                                For example: -m 'mark1 and not mark2'.
-        reporting:
+          -m MARKEXPR           Only run tests matching given mark expression. For
+                                example: -m 'mark1 and not mark2'.
+        Reporting:
           --durations=N *
-          -V, --version         display pytest version and information about plugins.
+          -V, --version         Display pytest version and information about plugins.
                                 When given twice, also display information about
                                 plugins.
         *setup.cfg*
@@ -71,9 +71,9 @@ def test_empty_help_param(pytester: Pytester) -> None:
     assert result.ret == 0
     lines = [
         "  required_plugins (args):",
-        "                        plugins that must be present for pytest to run*",
+        "                        Plugins that must be present for pytest to run*",
         "  test_ini (bool):*",
-        "environment variables:",
+        "Environment variables:",
     ]
     result.stdout.fnmatch_lines(lines, consecutive=True)
 

testing/test_stepwise.py

@@ -277,4 +277,4 @@ def test_stepwise_skip_is_independent(pytester: Pytester) -> None:
 
 def test_sw_skip_help(pytester: Pytester) -> None:
     result = pytester.runpytest("-h")
-    result.stdout.fnmatch_lines("*implicitly enables --stepwise.")
+    result.stdout.fnmatch_lines("*Implicitly enables --stepwise.")