Fix all Ruff docstring issues

This MR address any docstring issues reported by Ruff.

gwdatafind/__main__.py

@@ -15,8 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with GWDataFind.  If not, see <http://www.gnu.org/licenses/>.
 
-"""Query a GWDataFind server for information.
-"""
+"""Query a GWDataFind server for information."""
 
 import argparse
 import re
@@ -44,7 +43,7 @@ class DataFindFormatter(
     argparse.ArgumentDefaultsHelpFormatter,
     argparse.RawDescriptionHelpFormatter,
 ):
-    pass
+    """Custom `argparse.Formatter` for GWDataFind."""
 
 
 class DataFindArgumentParser(argparse.ArgumentParser):
@@ -52,16 +51,15 @@ class DataFindArgumentParser(argparse.ArgumentParser):
 
     Mainly to handle the legacy mutually-exclusive optional arguments...
     """
+
     def __init__(self, *args, **kwargs):
-        """Create a new `DataFindArgumentParser`.
-        """
+        """Create a new `DataFindArgumentParser`."""
         kwargs.setdefault("formatter_class", DataFindFormatter)
         super().__init__(*args, **kwargs)
         self._optionals.title = "Optional arguments"
 
     def parse_args(self, *args, **kwargs):
-        """Parse arguments with an extra sanity check.
-        """
+        """Parse arguments with an extra sanity check."""
         args = super().parse_args(*args, **kwargs)
         args.show_urls = not any((args.ping, args.show_observatories,
                                   args.show_types, args.show_times,
@@ -100,8 +98,7 @@ class DataFindArgumentParser(argparse.ArgumentParser):
 
 
 def command_line():
-    """Build an `~argparse.ArgumentParser` for the `gwdatafind` CLI.
-    """
+    """Build an `~argparse.ArgumentParser` for the `gwdatafind` CLI."""
     try:
         defhost = get_default_host()
     except ValueError:
@@ -524,8 +521,7 @@ def postprocess_cache(urls, args, out):
 # -- CLI ----------------------------------------------------------------------
 
 def main(args=None):
-    """Run the thing.
-    """
+    """Run the thing."""
     # parse command line
     parser = command_line()
     opts = parser.parse_args(args=args)