Fix docstrings formatting

Fix warnings/errors reported by Sphinx

qubes/__init__.py

@@ -325,8 +325,8 @@ class property(object):  # pylint: disable=redefined-builtin,invalid-name
         setter. Can raise QubesValueError if the value is invalid.
 
         :param untrusted_newvalue: value to be validated
-        :return sanitized value
-        :raises qubes.exc.QubesValueError
+        :return: sanitized value
+        :raises: qubes.exc.QubesValueError
         '''
         # do not treat type='str' as sufficient validation
         if self.type is not None and self.type is not str:

qubes/backup.py

@@ -119,6 +119,7 @@ class BackupHeader(object):
 
         :param untrusted_header_text: header content
         :type untrusted_header_text: basestring
+
         .. warning::
             This function may be exposed to not yet verified header,
             so is security critical.

qubes/dochelpers.py

@@ -249,7 +249,7 @@ class OptionsCheckVisitor(docutils.nodes.SparseNodeVisitor):
             While the documentation talks about a
             'SparseNodeVisitor.depart_document()' function, this function does
             not exists. (For details see implementation of
-            :py:method:`NodeVisitor.dispatch_departure()`) So we need to
+            :py:meth:`NodeVisitor.dispatch_departure()`) So we need to
             manually call this.
         '''
         if ignored_options is None:
@@ -316,7 +316,7 @@ class CommandCheckVisitor(docutils.nodes.SparseNodeVisitor):
             While the documentation talks about a
             'SparseNodeVisitor.depart_document()' function, this function does
             not exists. (For details see implementation of
-            :py:method:`NodeVisitor.dispatch_departure()`) So we need to
+            :py:meth:`NodeVisitor.dispatch_departure()`) So we need to
             manually call this.
         '''
         if self.sub_commands:

qubes/tools/__init__.py

@@ -304,10 +304,12 @@ class QubesArgumentParser(argparse.ArgumentParser):
     :param bool want_force_root: add ``--force-root`` option
     :param mixed vmname_nargs: The number of ``VMNAME`` arguments that should be
         consumed. Values include:
+
             - N (an integer) consumes N arguments (and produces a list)
             - '?' consumes zero or one arguments
             - '*' consumes zero or more arguments (and produces a list)
             - '+' consumes one or more arguments (and produces a list)
+
     *kwargs* are passed to :py:class:`argparser.ArgumentParser`.
 
     Currenty supported options:

qubes/vm/qubesvm.py

@@ -578,7 +578,7 @@ class QubesVM(qubes.vm.mix.net.NetVMMixin, qubes.vm.BaseVM):
 
     @property
     def block_devices(self):
-        ''' Return all :py:class:`qubes.storage.BlockDevice`s for current domain
+        ''' Return all :py:class:`qubes.storage.BlockDevice` for current domain
         for serialization in the libvirt XML template as <disk>.
         '''
         for v in self.volumes.values():