Move CLI options to correct help section

Before:

    pytest-warnings:
      -W, --pythonwarnings PYTHONWARNINGS
                            Set which warnings to report, see -W option of Python itself
      --maxfail=num         Exit after first num failures or errors
      --strict-config       Any warnings encountered while parsing the `pytest` section of the configuration file raise errors
      --strict-markers      Markers not registered in the `markers` section of the configuration file raise errors
      --strict              (Deprecated) alias to --strict-markers
      -c, --config-file FILE
                            Load configuration from `FILE` instead of trying to locate one of the implicit configuration files.
      --continue-on-collection-errors
                            Force test execution even if collection errors occur
      --rootdir=ROOTDIR     Define root directory for tests. Can be relative path: 'root_dir', './root_dir', 'root_dir/another_dir/'; absolute path: '/home/user/root_dir'; path with variables: '$HOME/root_dir'.

But other than -W, those options aren't related to pytest-warnings at all.

This is a regression in 19e99ab, which added
`group = parser.getgroup("pytest-warnings")` in the middle of those "general"
options, thus moving the help section for some of them.

Author: The-Compiler

src/_pytest/main.py

@@ -92,20 +92,6 @@ def pytest_addoption(parser: Parser) -> None:
         const=1,
         help="Exit instantly on first error or failed test",
     )
-    group = parser.getgroup("pytest-warnings")
-    group.addoption(
-        "-W",
-        "--pythonwarnings",
-        action="append",
-        help="Set which warnings to report, see -W option of Python itself",
-    )
-    parser.addini(
-        "filterwarnings",
-        type="linelist",
-        help="Each line specifies a pattern for "
-        "warnings.filterwarnings. "
-        "Processed after -W/--pythonwarnings.",
-    )
     group._addoption(
         "--maxfail",
         metavar="num",
@@ -157,6 +143,21 @@ def pytest_addoption(parser: Parser) -> None:
         "'$HOME/root_dir'.",
     )
 
+    group = parser.getgroup("pytest-warnings")
+    group.addoption(
+        "-W",
+        "--pythonwarnings",
+        action="append",
+        help="Set which warnings to report, see -W option of Python itself",
+    )
+    parser.addini(
+        "filterwarnings",
+        type="linelist",
+        help="Each line specifies a pattern for "
+        "warnings.filterwarnings. "
+        "Processed after -W/--pythonwarnings.",
+    )
+
     group = parser.getgroup("collect", "collection")
     group.addoption(
         "--collectonly",