Fix four docstring parameter names that do not match the signature

pyvo/dal/sia2.py

@@ -163,8 +163,10 @@ def __init__(self, baseurl, *, capability_description=None, session=None, check_
 
         Parameters
         ----------
-        url : str
+        baseurl : str
            url - URL of the SIA2service (base or query endpoint)
+        capability_description : str
+           Optional description of the service.
         session : object
            optional session to use for network requests
         check_baseurl : bool

pyvo/mivot/utils/mivot_utils.py

@@ -293,7 +293,7 @@ def populate_instance(property_instance, class_name,
             Table (from parsed VOTable) of the mapped data
         dmtype : string
             common dmtype of object attributes
-        as_literal : boolean, optional (default isTrue)
+        as_literals : boolean, optional (default is True)
             If True, all attribute are set with literal values (@value="...")
         package : str, optional (default as None)
             Package name possibly prefixing dmroles

pyvo/registry/rtcons.py

@@ -1041,7 +1041,7 @@ def __init__(self, times, *, inclusive=False):
 
         Parameters
         ----------
-        spec : astropy.Time or a 2-tuple of astropy.Time-s
+        times : astropy.Time or a 2-tuple of astropy.Time-s
             A point in time or time interval to cover.  Plain numbers
             are interpreted as MJD.  All resources *overlapping* the
             interval are returned.

pyvo/utils/xml/elements.py

@@ -27,7 +27,7 @@ def parse_for_object(
     ----------
     source : str or readable file-like object
         Path or file object containing a tableset xml file.
-    object : object type to return (subtype `~pyvo.utils.xml.elements.Element`)
+    object_type : object type to return (subtype `~pyvo.utils.xml.elements.Element`)
     pedantic : bool, optional
         When `True`, raise an error when the file violates the spec,
         otherwise issue a warning.  Warnings may be controlled using