docs: fix utr class name (#200)

Author: ovesh

genome_kit/genome.py

@@ -277,7 +277,7 @@ def utr5s(self):  # pragma: no cover
         :py:class:`~genome_kit.Utr5Table`
            An object that supports looping or queries over annotated coding sequences.
         """
-        return mock_result(_ga.Utr5Table)
+        return mock_result(_ga.UtrTable)
 
     @mock
     @property
@@ -291,7 +291,7 @@ def utr3s(self):  # pragma: no cover
         :py:class:`~genome_kit.Utr3Table`
            An object that supports looping or queries over annotated coding sequences.
         """
-        return mock_result(_ga.Utr3Table)
+        return mock_result(_ga.UtrTable)
 
     def find_motif(self, interval, motif, match_position=0, find_overlapping_motifs=False):
         """Find a genomic motif in an interval on a :py:class:`~genome_kit.Genome`.

genome_kit/genome_annotation.py

@@ -913,7 +913,7 @@ def utr5(self):  # pragma: no cover
 
         Returns
         -------
-        :py:class:`~genome_kit.Utr5` | :py:data:`None`
+        :py:class:`~genome_kit.Utr` | :py:data:`None`
             The UTR5 contained within this exon, if any.
         """
         return mock_result(Utr)
@@ -925,7 +925,7 @@ def utr3(self):  # pragma: no cover
 
         Returns
         -------
-        :py:class:`~genome_kit.Utr3` | :py:data:`None`
+        :py:class:`~genome_kit.Utr` | :py:data:`None`
             The UTR3 contained within this exon, if any.
         """
         return mock_result(Utr)